AP Physics Tutorials with Sal Khan

Video Lectures

Displaying all 156 video lectures.
Lecture 1
Introduction to physics | One-dimensional motion
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Introduction to physics | One-dimensional motion
An overview video of what physics is about as we delve deeper in future videos!

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Lecture 2
Intro to vectors & scalars | One-dimensional motion
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Intro to vectors & scalars | One-dimensional motion
Distance, displacement, speed and velocity. Difference between vectors and scalars. Created by Sal Khan.

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Lecture 3
Calculating average velocity or speed | One-dimensional motion
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Calculating average velocity or speed | One-dimensional motion
Example of calculating speed and velocity. Created by Sal Khan.

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Lecture 4
Solving for time | One-dimensional motion
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Solving for time | One-dimensional motion
Simple example of solving for time given distance and rate. Created by Sal Khan.

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Lecture 5
Displacement from time and velocity example | One-dimensional motion
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Displacement from time and velocity example | One-dimensional motion
Worked example of calculating displacement from time and velocity. Created by Sal Khan.

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Lecture 6
Acceleration | One-dimensional motion
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Acceleration | One-dimensional motion
Calculating the acceleration of a Porsche. Created by Sal Khan.

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Lecture 7
More on Newton's first law of motion
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More on Newton's first law of motion
Newton's First Law (Galileo's Law of Inertia). Created by Sal Khan.

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Lecture 8
Newton's second law of motion | Forces and Newton's laws of motion
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Newton's second law of motion | Forces and Newton's laws of motion
Newton's Second Law of Motion: F=ma. Created by Sal Khan.

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Lecture 9
Newton's third law of motion | Forces and Newton's laws of motion
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Newton's third law of motion | Forces and Newton's laws of motion
Every action has an equal and opposite reaction. Created by Sal Khan.

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Lecture 10
Airbus A380 take-off time | One-dimensional motion
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Airbus A380 take-off time | One-dimensional motion
Figuring how long it takes an a380 to take off given a constant acceleration. Created by Sal Khan.

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Lecture 11
Airbus A380 take-off distance | One-dimensional motion
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Airbus A380 take-off distance | One-dimensional motion
How long of a runway does an A380 need? Created by Sal Khan.

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Lecture 12
Why distance is area under velocity-time line
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Why distance is area under velocity-time line
How long of a runway does an A380 need? Created by Sal Khan.

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Lecture 13
Average velocity for constant acceleration | One-dimensional motion
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Average velocity for constant acceleration | One-dimensional motion
Calculating average velocity when acceleration is constant. Created by Sal Khan.

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Lecture 14
Acceleration of aircraft carrier take-off | One-dimensional motion
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Acceleration of aircraft carrier take-off | One-dimensional motion
Using what we know about take-off velocity and runway length to determine acceleration. Created by Sal Khan.

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Lecture 15
Race cars with constant speed around curve
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Race cars with constant speed around curve
When acceleration could involve a change in direction and not speed. Created by Sal Khan.

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Lecture 16
Introduction to gravity | Centripetal force and gravitation
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Introduction to gravity | Centripetal force and gravitation
Basics of gravity and the Law of Universal Gravitation. Created by Sal Khan.

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Lecture 17
Mass and weight clarification | Centripetal force and gravitation
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Mass and weight clarification | Centripetal force and gravitation
Difference between mass and weight. Created by Sal Khan.

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Lecture 18
Gravity for astronauts in orbit | Centripetal force and gravitation
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Gravity for astronauts in orbit | Centripetal force and gravitation
Why do astronauts appear weightless despite being near the Earth? Created by Sal Khan.

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Lecture 19
Would a brick or feather fall faster?
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Would a brick or feather fall faster?
What would fall faster on the moon? Created by Sal Khan.

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Lecture 20
Deriving displacement as a function of time, acceleration, and initial velocity
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Deriving displacement as a function of time, acceleration, and initial velocity
Deriving displacement as a function of time, constant acceleration and initial velocity. Created by Sal Khan.

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Lecture 21
Plotting projectile displacement, acceleration, and velocity
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Plotting projectile displacement, acceleration, and velocity
Plotting projectile displacement, acceleration, and velocity as a function to change in time. Created by Sal Khan.

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Lecture 22
Projectile height given time | One-dimensional motion
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Projectile height given time | One-dimensional motion
Figuring out how high a ball gets given how long it spends in the air. Created by Sal Khan.

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Lecture 23
Deriving max projectile displacement given time
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Deriving max projectile displacement given time
Deriving a formula for maximum projectile displacement as a function of elapsed time. Created by Sal Khan.

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Lecture 24
Impact velocity from given height | One-dimensional motion
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Impact velocity from given height | One-dimensional motion
Determining how fast something will be traveling upon impact when it is released from a given height. Created by Sal Khan.

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Lecture 25
Visualizing vectors in 2 dimensions | Two-dimensional motion
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Visualizing vectors in 2 dimensions | Two-dimensional motion
Visualizing, adding and breaking down vectors in 2 dimensions. Created by Sal Khan.

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Lecture 26
Projectile at an angle | Two-dimensional motion
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Projectile at an angle | Two-dimensional motion
Figuring out the horizontal displacement for a projectile launched at an angle. Created by Sal Khan.

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Lecture 27
Different way to determine time in air | Two-dimensional motion
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Different way to determine time in air | Two-dimensional motion
Another way to determine time in the air given an initial vertical velocity. Created by Sal Khan.

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Lecture 28
Launching and landing on different elevations | Two-dimensional motion
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Launching and landing on different elevations | Two-dimensional motion
More complicated example involving launching and landing at different elevations. Created by Sal Khan.

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Lecture 29
Total displacement for projectile | Two-dimensional motion
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Total displacement for projectile | Two-dimensional motion
Reconstructing the total displacement vector for a projectile. Created by Sal Khan.

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Lecture 30
Total final velocity for projectile | Two-dimensional motion
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Total final velocity for projectile | Two-dimensional motion
Calculating the total final velocity for a projectile landing at a different altitude (mistake near end: I write 29.03 when it should be 26.03 m/s and the final total magnitude should be 26.55 m/s 78.7 degrees below horizontal. Created by Sal Khan.

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Lecture 31
Correction to total final velocity for projectile
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Correction to total final velocity for projectile
Correction to "Total Final Velocity for Projectile" Video. Created by Sal Khan.

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Lecture 32
Projectile on an incline | Two-dimensional motion
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Projectile on an incline | Two-dimensional motion
Challenging problem of a projectile on an inclined plane. Created by Sal Khan.

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Lecture 33
Unit vectors and engineering notation | Two-dimensional motion
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Unit vectors and engineering notation | Two-dimensional motion
Using unit vectors to represent the components of a vector. Created by Sal Khan.

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Lecture 34
Optimal angle for a projectile part 1: Components of initial velocity
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Optimal angle for a projectile part 1: Components of initial velocity
You want a projectile to fly as far as possible, at which angle should you launch it? We'll start with formulas for the initial velocity. Created by Sal Khan.

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Lecture 35
Optimal angle for a projectile part 2: Hangtime
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Optimal angle for a projectile part 2: Hangtime
Now it's time to think about hangtime for our far-flung projectile. Created by Sal Khan.

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Lecture 36
Optimal angle for a projectile part 3: Horizontal distance as a function of angle (and speed)
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Optimal angle for a projectile part 3: Horizontal distance as a function of angle (and speed)
In this video, we'll finish writing the formula for distance as a function of the angle. Created by Sal Khan.

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Lecture 37
Optimal angle for a projectile part 4: Finding the optimal angle and distance with a bit of calculus
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Optimal angle for a projectile part 4: Finding the optimal angle and distance with a bit of calculus
Created by Sal Khan.

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Lecture 38
Normal force and contact force | Forces and Newton's laws of motion
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Normal force and contact force | Forces and Newton's laws of motion
The force that keeps a block of ice from falling towards the center of the earth. Created by Sal Khan.

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Lecture 39
Normal force in an elevator | Forces and Newton's laws of motion
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Normal force in an elevator | Forces and Newton's laws of motion
How the normal force changes when an elevator accelerates. Created by Sal Khan.

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Lecture 40
Inclined plane force components | Forces and Newton's laws of motion
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Inclined plane force components | Forces and Newton's laws of motion
Figuring out the components of the force due to gravity that are parallel and perpendicular to the surface of an inclined plane. Created by Sal Khan.

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Lecture 41
Ice accelerating down an incline | Forces and Newton's laws of motion
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Ice accelerating down an incline | Forces and Newton's laws of motion
Figuring out the acceleration of ice down a plane made of ice. Created by Sal Khan.

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Lecture 42
Force of friction keeping the block stationary
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Force of friction keeping the block stationary
Block of wood kept stationary by the force of friction (Correction made in next video). Created by Sal Khan.

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Lecture 43
Correction to force of friction keeping the block stationary
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Correction to force of friction keeping the block stationary
Correction to Force of Friction Keeping the Block Stationary. Created by Sal Khan.

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Lecture 44
Force of friction keeping velocity constant
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Force of friction keeping velocity constant
Calculating the coefficient of kinetic friction (correction made in next video). Created by Sal Khan.

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Lecture 45
Intuition on static and kinetic friction comparisons
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Intuition on static and kinetic friction comparisons
Why static friction is harder to overcome than kinetic friction. Created by Sal Khan.

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Lecture 46
Static and kinetic friction example | Forces and Newton's laws of motion
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Static and kinetic friction example | Forces and Newton's laws of motion
Thinking about the coefficients of static and kinetic friction. Created by Sal Khan.

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Lecture 47
Introduction to tension | Forces and Newton's laws of motion
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Introduction to tension | Forces and Newton's laws of motion
An introduction to tension. Solving for the tension(s) in a set of wires when a weight is hanging from them. Created by Sal Khan.

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Lecture 48
Introduction to tension (part 2) | Forces and Newton's laws of motion
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Introduction to tension (part 2) | Forces and Newton's laws of motion
A slightly more difficult tension problem. Created by Sal Khan.

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Lecture 49
Tension in an accelerating system and pie in the face
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Tension in an accelerating system and pie in the face
The second part to the complicated problem. We figure out the tension in the wire connecting the two masses. Then we figure our how much we need to accelerate a pie for it to safely reach a man's face. Created by Sal Khan.

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Lecture 50
Introduction to momentum | Impacts and linear momentum
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Introduction to momentum | Impacts and linear momentum
What momentum is. A simple problem involving momentum. Created by Sal Khan.

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Lecture 51
Momentum: Ice skater throws a ball | Impacts and linear momentum
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Momentum: Ice skater throws a ball | Impacts and linear momentum
A simple conservation of momentum problem involving an ice skater and a ball. Created by Sal Khan.

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Lecture 52
2-dimensional momentum problem | Impacts and linear momentum
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2-dimensional momentum problem | Impacts and linear momentum
An example of conservation of momentum in two dimensions. Created by Sal Khan.

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Lecture 53
2-dimensional momentum problem (part 2)
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2-dimensional momentum problem (part 2)
We finish the 2-dimensional momentum problem. Created by Sal Khan.

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Lecture 54
Introduction to work and energy | Work and energy
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Introduction to work and energy | Work and energy
Introduction to work and energy. Created by Sal Khan.

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Lecture 55
Work and energy (part 2) | Work and energy
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Work and energy (part 2) | Work and energy
More on work. Introduction to Kinetic and Potential Energies. Created by Sal Khan.

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Lecture 56
Conservation of energy | Work and energy
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Conservation of energy | Work and energy
Using the law of conservation of energy to see how potential energy is converted into kinetic energy. Created by Sal Khan.

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Lecture 57
Work/energy problem with friction | Work and energy
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Work/energy problem with friction | Work and energy
A conservation of energy problem where all of the energy is not conserved. Created by Sal Khan.

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Lecture 58
Introduction to mechanical advantage | Work and energy
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Introduction to mechanical advantage | Work and energy
Introduction to simple machines, mechanical advantage and moments. Created by Sal Khan.

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Lecture 59
Mechanical advantage (part 2) | Work and energy
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Mechanical advantage (part 2) | Work and energy
More on mechanical advantage, levers and moments. Created by Sal Khan.

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Lecture 60
Mechanical advantage (part 3) | Work and energy
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Mechanical advantage (part 3) | Work and energy
Introduction to pulleys and wedges. Created by Sal Khan.

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Lecture 61
Center of mass | Impacts and linear momentum
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Center of mass | Impacts and linear momentum
In this video, David solves an example elastic collision problem to find the final velocities using the easier/shortcut approach.

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Lecture 62
Introduction to torque | Moments, torque, and angular momentum
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Introduction to torque | Moments, torque, and angular momentum
An introduction to torque. Created by Sal Khan.

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Lecture 63
Moments | Moments, torque, and angular momentum
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Moments | Moments, torque, and angular momentum
Introduction to moments. Created by Sal Khan.

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Lecture 64
Moments (part 2) | Moments, torque, and angular momentum
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Moments (part 2) | Moments, torque, and angular momentum
2 more moment problems. Created by Sal Khan.

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Lecture 65
Unit vector notation | Two-dimensional motion
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Unit vector notation | Two-dimensional motion
Expressing a vector as the scaled sum of unit vectors. Created by Sal Khan.

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Lecture 66
Unit vector notation (part 2) | Two-dimensional motion
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Unit vector notation (part 2) | Two-dimensional motion
More on unit vector notation. Showing that adding the x and y components of two vectors is equivalent to adding the vectors visually using the head-to-tail method. Created by Sal Khan.

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Lecture 67
Projectile motion with ordered set notation
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Projectile motion with ordered set notation
Solving the second part to the projectile motion problem (with wind gust) using ordered set vector notation. Created by Sal Khan.

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Lecture 68
Centripetal force and acceleration intuition
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Centripetal force and acceleration intuition
The direction of the force in cases of circular motion at constant speeds. Created by Sal Khan.

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Lecture 69
Visual understanding of centripetal acceleration formula
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Visual understanding of centripetal acceleration formula
Visual understanding of how centripetal acceleration relates to velocity and radius. Created by Sal Khan.

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Lecture 70
Relationship between angular velocity and speed
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Relationship between angular velocity and speed
How angular velocity relates to speed. Created by Sal Khan.

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Lecture 71
Calculus proof of centripetal acceleration formula
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Calculus proof of centripetal acceleration formula
Proving that a = v^2/r. Created by Sal Khan.

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Lecture 72
Loop de loop question | Centripetal force and gravitation
Play Video
Loop de loop question | Centripetal force and gravitation
Asks students to find the minimum speed necessary to complete the loop de loop. Created by Sal Khan.

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Lecture 73
Loop de loop answer part 1 | Centripetal force and gravitation
Play Video
Loop de loop answer part 1 | Centripetal force and gravitation
Figuring out the minimum speed at the top of the loop de loop to stay on the track. Created by Sal Khan.

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Lecture 74
Loop de loop answer part 2 | Centripetal force and gravitation
Play Video
Loop de loop answer part 2 | Centripetal force and gravitation
Figuring out the car's average speed while completing the loop de loop. Created by Sal Khan.

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Lecture 75
Acceleration due to gravity at the space station
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Acceleration due to gravity at the space station
What is the acceleration due to gravity at the space station. Created by Sal Khan.

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Lecture 76
Space station speed in orbit | Centripetal force and gravitation
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Space station speed in orbit | Centripetal force and gravitation
Speed necessary for the space station to stay in orbit. Created by Sal Khan.

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Lecture 77
Conservation of angular momemtum
Play Video
Conservation of angular momemtum
Angular momentum is constant when there is no net torque.
More free lessons at: http://www.khanacademy.org/video?v=s_R8d3isJDA
Lecture 78
Introduction to Newton's law of gravitation
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Introduction to Newton's law of gravitation
A little bit on gravity. Created by Sal Khan.

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Lecture 79
Gravitation (part 2) | Centripetal force and gravitation
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Gravitation (part 2) | Centripetal force and gravitation
A little bit more on gravity. Created by Sal Khan.

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Lecture 80
Intro to springs and Hooke's law | Work and energy
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Intro to springs and Hooke's law | Work and energy
Introduction to Hooke's Law. Created by Sal Khan.

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Lecture 81
Potential energy stored in a spring | Work and energy
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Potential energy stored in a spring | Work and energy
Work needed to compress a spring is the same thing as the potential energy stored in the compressed spring. Created by Sal Khan.

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Lecture 82
Spring potential energy example (mistake in math)
Play Video
Spring potential energy example (mistake in math)
A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!). Created by Sal Khan.

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Lecture 83
Introduction to harmonic motion | Oscillatory motion
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Introduction to harmonic motion | Oscillatory motion
Intuition behind the motion of a mass on a spring (some calculus near the end). Created by Sal Khan.

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Lecture 84
Harmonic motion part 2 (calculus) | Oscillatory motion
Play Video
Harmonic motion part 2 (calculus) | Oscillatory motion
We test whether Acos(wt) can describe the motion of the mass on a spring by substituting into the differential equation F=-kx. Created by Sal Khan.

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Lecture 85
Harmonic motion part 3 (no calculus) | Oscillatory motion
Play Video
Harmonic motion part 3 (no calculus) | Oscillatory motion
Figuring out the period, frequency, and amplitude of the harmonic motion of a mass attached to a spring. Created by Sal Khan.

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Lecture 86
Pressure and Pascal's principle (part 1) | Fluids
Play Video
Pressure and Pascal's principle (part 1) | Fluids
Sal explains the difference between liquids and gasses (both fluids). He then starts a calculation of the work done on a liquid in a U-shaped container. Created by Sal Khan.

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Lecture 87
Pressure and Pascal's principle (part 2) | Fluids
Play Video
Pressure and Pascal's principle (part 2) | Fluids
Sal finishes the calculation or work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principal. Created by Sal Khan.

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Lecture 88
Pressure at a depth in a fluid | Fluids
Play Video
Pressure at a depth in a fluid | Fluids
Sal finishes the calculation or work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principal. Created by Sal Khan.

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Lecture 89
Finding height of fluid in a barometer | Fluids
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Finding height of fluid in a barometer | Fluids
Using our understanding of fluid pressure to figure out the height of a column of mercury. Created by Sal Khan.

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Lecture 90
Archimedes principle and buoyant force | Fluids
Play Video
Archimedes principle and buoyant force | Fluids
Introduction to Archimedes' principle and buoyant force. Created by Sal Khan.

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Lecture 91
Buoyant force example problems | Fluids
Play Video
Buoyant force example problems | Fluids
A couple of problems involving Archimedes' principle and buoyant forces. Created by Sal Khan.

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Lecture 92
Volume flow rate and equation of continuity | Fluids
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Volume flow rate and equation of continuity | Fluids
Sal introduces the notion of moving fluids and laminar flow. Then he uses the incompressibility of a liquid to show that the volume flow rate (flux) must remain constant. Sal then derives the equation of continuity in terms of the area and speed. . Created by Sal Khan.

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Lecture 93
Bernoulli's equation (part 1) | Fluids
Play Video
Bernoulli's equation (part 1) | Fluids
This is the first of two videos where Sal derives Bernoulli's equation. Created by Sal Khan.

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Lecture 94
Bernoulli's equation (part 2) | Fluids
Play Video
Bernoulli's equation (part 2) | Fluids
This is the second of two videos where Sal derives Bernoulli's equation. In the second half of the video Sal also begins an example problem where liquid exits a hole in a container. Created by Sal Khan.

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Lecture 95
Bernoulli's equation (part 3) | Fluids
Play Video
Bernoulli's equation (part 3) | Fluids
Sal finishes the example problem where liquid exits a hole in a container. . Created by Sal Khan.

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Lecture 96
Bernoulli's equation (part 4) | Fluids
Play Video
Bernoulli's equation (part 4) | Fluids
Clarification of, and more thoughts on, the Bernoulli's equation example problem where liquid exits a hole in a container. Created by Sal Khan.

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Lecture 97
Bernoulli's example problem | Fluids
Play Video
Bernoulli's example problem | Fluids
Sal solves a Bernoulli's equation example problem where fluid is moving through a pipe of varying diameter. Created by Sal Khan.

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Lecture 98
Thermodynamics part 1: Molecular theory of gases
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Thermodynamics part 1: Molecular theory of gases
Intuition of how gases generate pressure in a container and why pressure x volume is proportional to the combined kinetic energy of the molecules in the volume. Created by Sal Khan.

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Lecture 99
Thermodynamics part 2: Ideal gas law | Thermodynamics
Play Video
Thermodynamics part 2: Ideal gas law | Thermodynamics
Intuition of how gases generate pressure in a container and why pressure x volume is proportional to the combined kinetic energy of the molecules in the volume. Created by Sal Khan.

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Lecture 100
Thermodynamics part 3: Kelvin scale and Ideal gas law example
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Thermodynamics part 3: Kelvin scale and Ideal gas law example
Sal makes the case for the Kelvin scale of temperature and absolute zero by showing that temperature is proportional to kinetic energy. Then he explains that you need to use the Kelvin scale in the ideal gas law. To finish he does a sample ideal gas law problem. Created by Sal Khan.

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Lecture 101
Thermodynamics part 4: Moles and the ideal gas law
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Thermodynamics part 4: Moles and the ideal gas law
Sal explains the concept of a mole. Then he derives the molar version of the ideal gas law PV=nRT, where the gas constant R=8.31 J/molK. Created by Sal Khan.

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Lecture 102
Thermodynamics part 5: Molar ideal gas law problem
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Thermodynamics part 5: Molar ideal gas law problem
Sal uses the molar version of the ideal gas law to solve for the number of moles in a gas. He also shows how to convert this answer into number of molecules using Avogadro's number. Created by Sal Khan.

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Lecture 103
Electrostatics (part 1): Introduction to Charge and Coulomb's Law
Play Video
Electrostatics (part 1): Introduction to Charge and Coulomb's Law
Introduction to Charge and Coulomb's Law (video from May 2008 that I forgot to upload)
More free lessons at: http://www.khanacademy.org/video?v=NXMgvrS8Gr8
Lecture 104
Electric field | Electric charge, electric force, and voltage
Play Video
Electric field | Electric charge, electric force, and voltage
We can think of the forces between charges as something that comes from a property of space. That property is called the electric field. Created by Sal Khan.

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Lecture 105
Proof: Field from infinite plate (part 1) | Electrostatics | Electrical engineering
Play Video
Proof: Field from infinite plate (part 1) | Electrostatics | Electrical engineering
Advanced proof of the formula for the electric field generated by a uniformly charged, infinite plate. Created by Sal Khan.

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Electrical engineering on Khan Academy: A summary of the math and science preparation that will help you have the best experience with electrical engineering taught on Khan Academy. Become familiar with engineering numbers and notation, and learn about the two most important electrical quantities: current and voltage.





Subscribe to Khan Academy’s Electrical Engineering channel: https://www.youtube.com/channel/UC8JT97hQjMVWeO0B-x8eVxQ?sub...
Lecture 106
Proof: Field from infinite plate (part 2) | Electrostatics | Electrical engineering
Play Video
Proof: Field from infinite plate (part 2) | Electrostatics | Electrical engineering
We see that the infinite, uniformly charged plate generates a constant electric field (independent of the height above the plate). Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/electrical-engineering/e...

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Electrical engineering on Khan Academy: A summary of the math and science preparation that will help you have the best experience with electrical engineering taught on Khan Academy. Become familiar with engineering numbers and notation, and learn about the two most important electrical quantities: current and voltage.





Subscribe to Khan Academy’s Electrical Engineering channel: https://www.youtube.com/channel/UC8JT97hQjMVWeO0B-x8eVxQ?sub...
Lecture 107
Electric potential energy | Electrostatics | Electrical engineering
Play Video
Electric potential energy | Electrostatics | Electrical engineering
Introduction to electric potential energy. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/electrical-engineering/r...

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Electrical engineering on Khan Academy: A summary of the math and science preparation that will help you have the best experience with electrical engineering taught on Khan Academy. Become familiar with engineering numbers and notation, and learn about the two most important electrical quantities: current and voltage.





Subscribe to Khan Academy’s Electrical Engineering channel: https://www.youtube.com/channel/UC8JT97hQjMVWeO0B-x8eVxQ?sub...
Lecture 108
Electric potential energy (part 2-- involves calculus)
Play Video
Electric potential energy (part 2-- involves calculus)
Electric potential energy difference in a varying field. Created by Sal Khan.

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Lecture 109
Voltage | Electric charge, electric force, and voltage
Play Video
Voltage | Electric charge, electric force, and voltage
Sal explains the difference between electrical potential (voltage) and electrical potential energy. Created by Sal Khan.

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Lecture 110
Capacitance | Circuits
Play Video
Capacitance | Circuits
Introduction to the capacitance of a two place capacitor. Created by Sal Khan.

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Lecture 111
Introduction to circuits and Ohm's law | Circuits
Play Video
Introduction to circuits and Ohm's law | Circuits
Introduction to electricity, circuits, current, and resistance. Created by Sal Khan.

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Lecture 112
Resistors in series | Circuits
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Resistors in series | Circuits
Resistors that come one after another. Created by Sal Khan.

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Lecture 113
Resistors in parallel | Circuits
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Resistors in parallel | Circuits
Resistors that run alongside each other. Created by Sal Khan.

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Lecture 114
Example: Analyzing a more complex resistor circuit
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Example: Analyzing a more complex resistor circuit
A hairy resistance problem. Created by Sal Khan.

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Lecture 115
Cross product 1 | Magnetic forces, magnetic fields, and Faraday's law
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Cross product 1 | Magnetic forces, magnetic fields, and Faraday's law
Introduction to the cross product. Created by Sal Khan.

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Lecture 116
Cross product 2 | Magnetic forces, magnetic fields, and Faraday's law
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Cross product 2 | Magnetic forces, magnetic fields, and Faraday's law
A little more intuition on the cross product. Created by Sal Khan.

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Lecture 117
Cross product and torque | Moments, torque, and angular momentum
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Cross product and torque | Moments, torque, and angular momentum
The cross product and the direction of torque. Created by Sal Khan.

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Lecture 118
Introduction to magnetism
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Introduction to magnetism
An introduction to magnetism. Created by Sal Khan.

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Lecture 119
Magnetic force on a charge
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Magnetic force on a charge
Sal shows how to find the size and direction of the magnetic force using F=qvB and the right hand rule. Created by Sal Khan.

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Lecture 120
Magnetic force on a proton example (part 1)
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Magnetic force on a proton example (part 1)
Sal does an example problem to determine the size and direction of the magnetic force on a proton moving through a magnetic field. Created by Sal Khan.

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Lecture 121
Magnetic force on a proton example (part 2)
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Magnetic force on a proton example (part 2)
Sal determines the radius of the circle traveled by the proton in the previous example by using the formula for centripetal acceleration. Created by Sal Khan.

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Lecture 122
Magnetic force on a current carrying wire
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Magnetic force on a current carrying wire
Sal derives the formula F=ILB to determine the force on a current carrying wire. Created by Sal Khan.

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Lecture 123
Magnetic field created by a current carrying wire
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Magnetic field created by a current carrying wire
See how a wire carrying a current creates a magnetic field. Created by Sal Khan.

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Lecture 124
Magnetic force between two currents going in the same direction
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Magnetic force between two currents going in the same direction
Sal shows how to determine the magnetic force between two currents going in the same direction. Created by Sal Khan.

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Lecture 125
Magnetic force between two currents going in opposite directions
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Magnetic force between two currents going in opposite directions
Sal shows how to determine the magnetic force between two currents going in opposite directions. Created by Sal Khan.

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Lecture 126
Electric motors (part 1)
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Electric motors (part 1)
Sal shows that there will be a net torque on a loop of current in a wire. Sal shows that this net torque will cause the loop to rotate. Created by Sal Khan.

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Lecture 127
Electric motors (part 2)
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Electric motors (part 2)
Sal shows that a commutator can be used in order to keep the loop of wire rotating in the magnetic field. Created by Sal Khan.

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Lecture 128
Electric motors (part 3)
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Electric motors (part 3)
Sal finishes the explanation of how a commutator will allow a loop of wire to continue spinning in a magnetic field, thereby allowing it to work as an electric motor. Created by Sal Khan.

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Lecture 129
Induced current in a wire
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Induced current in a wire
Sal determines the current and EMF induced in a wire pulled through a magnetic field. Created by Sal Khan.

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Lecture 130
The dot product | Magnetic forces, magnetic fields, and Faraday's law
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The dot product | Magnetic forces, magnetic fields, and Faraday's law
Introduction to the vector dot product. Created by Sal Khan.

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Lecture 131
Dot vs. cross product
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Dot vs. cross product
Understanding the differences between the dot and cross products. Created by Sal Khan.

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Lecture 132
Calculating dot and cross products with unit vector notation
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Calculating dot and cross products with unit vector notation
Calculating the dot and cross products when vectors are presented in their x, y, and z (or i,j, and k) components. Created by Sal Khan.

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Lecture 133
Introduction to waves | Mechanical waves and sound
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Introduction to waves | Mechanical waves and sound
Introduction to transverse and longitudinal waves. Created by Sal Khan.

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Lecture 134
Amplitude, period, frequency and wavelength of periodic waves
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Amplitude, period, frequency and wavelength of periodic waves
Amplitude, period, frequency and wavelength of periodic waves. Created by Sal Khan.

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Lecture 135
Introduction to the doppler effect | Mechanical waves and sound
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Introduction to the doppler effect | Mechanical waves and sound
Introduction to the Doppler Effect. Created by Sal Khan.

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Lecture 136
Doppler effect formula for observed frequency
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Doppler effect formula for observed frequency
Let's derive the formula for how the perceived frequency of a sound changes when its source is moving toward you. Created by Sal Khan.

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Lecture 137
Doppler effect formula when source is moving away
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Doppler effect formula when source is moving away
Let's look at the case where the source is moving away from the listener. Created by Sal Khan.

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Lecture 138
When the source and the wave move at the same velocity
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When the source and the wave move at the same velocity
What happens when both the listener and the source are moving together? Created by Sal Khan.

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Lecture 139
Mach numbers | Mechanical waves and sound
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Mach numbers | Mechanical waves and sound
We can measure speeds relative to the speed of sound. Created by Sal Khan.

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Lecture 140
Specular and diffuse reflection | Geometric optics
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Specular and diffuse reflection | Geometric optics
Specular and Diffuse Reflection. Created by Sal Khan.

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Lecture 141
Specular and diffuse reflection 2 | Geometric optics
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Specular and diffuse reflection 2 | Geometric optics
Specular and Diffuse Reflection 2. Created by Sal Khan.

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Lecture 142
Refraction and Snell's law | Geometric optics
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Refraction and Snell's law | Geometric optics
Refraction and Snell's Law. Created by Sal Khan.

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Lecture 143
Refraction in water | Geometric optics
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Refraction in water | Geometric optics
Refraction in Water. Created by Sal Khan.

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Lecture 144
Snell's law example 1 | Geometric optics
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Snell's law example 1 | Geometric optics
Snell's Law Example 1. Created by Sal Khan.

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Lecture 145
Snell's law example 2 | Geometric optics
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Snell's law example 2 | Geometric optics
Snell's Law Example 2. Created by Sal Khan.

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Lecture 146
Total internal reflection | Geometric optics
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Total internal reflection | Geometric optics
Critical incident angle and total internal reflection. Created by Sal Khan.

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Lecture 147
Virtual image | Geometric optics
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Virtual image | Geometric optics
Virtual Image. Created by Sal Khan.

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Lecture 148
Parabolic mirrors and real images | Geometric optics
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Parabolic mirrors and real images | Geometric optics
Parabolic Mirrors and Real Images. Created by Sal Khan.

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Lecture 149
Parabolic mirrors 2 | Geometric optics
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Parabolic mirrors 2 | Geometric optics
Parabolic Mirrors 2. Created by Sal Khan.

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Lecture 150
Convex parabolic mirrors | Geometric optics
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Convex parabolic mirrors | Geometric optics
Convex Parabolic Mirrors. Created by Sal Khan.

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Lecture 151
Convex lenses | Geometric optics
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Convex lenses | Geometric optics
Convex Lenses. Created by Sal Khan.

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Lecture 152
Convex lens examples | Geometric optics
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Convex lens examples | Geometric optics
Convex Lens Examples. Created by Sal Khan.

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Lecture 153
Concave lenses | Geometric optics
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Concave lenses | Geometric optics
Concave Lenses. Created by Sal Khan.

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Lecture 154
Object image and focal distance relationship (proof of formula)
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Object image and focal distance relationship (proof of formula)
Object Image and Focal Distance Relationship (Proof of Formula). Created by Sal Khan.

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Lecture 155
Object image height and distance relationship | Geometric optics
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Object image height and distance relationship | Geometric optics
Object Image Height and Distance Relationship. Created by Sal Khan.

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Lecture 156
Viewing g as the value of Earth's gravitational field near the surface
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Viewing g as the value of Earth's gravitational field near the surface
Viewing g as the value of Earth's gravitational field near the surface rather than the acceleration due to gravity near Earth's surface for an object in freefall. Created by Sal Khan.

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