Work and Energy Example |
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Video Lecture 46 of 83
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Date Added: July 18, 2015

### Lecture Description

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This video presents a comprehensive example of solving a complex problem using work and energy concepts that have been overviewed in previous video. First part of the video jumps straight to the problem where a person named John hits a hockey puck across a frozen lake at an initial velocity of 10m/s. The video asks to calculate the distance the puck will travel before stopping if the coefficient of kinetic friction between the puck & ice is 0.05. The mass & gravitational acceleration of the puck have respectively given as 0.5 kg and 10 m/s2.

Moving on, the video explains the procedures to solve the problem starting with finding the friction force from the product of reaction force and coefficient of kinetic friction. Doing so, the video shows how to find the reaction force from the given value of mass and gravity acceleration. Next, the video uses the formula of work & energy to find the net work done by the puck to travel before stopping. Later, the video uses the theory of work done equals to the product of working force and distance to finally determine the distance the puck travels before stopping.

### Course Description

Mechanics, the study of forces and physical bodies, underpins a very large proportion of all forms of engineering. A thorough understanding of mechanics is essential to any successful engineer. This course helps develop an understanding of the nature of forces with consideration for how they may be simplified in an engineering context. The conditions of equilibrium are then used to solve a number of problems in 2D and 3D before moving on to a broad range of topics including centroids, distributed loads, friction and virtual work. The course will also provide an introduction to dynamics, with a particular focus on the effects that forces have upon motion.

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