   Differential Equations of Motion
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Video Lecture 16 of 18
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### Lecture Description

These equations have 2nd derivatives because acceleration is in Newton's Law F = ma. The key model equation is (second derivative) y'' = minus y or y'' = minus a^2 y.
There are two solutions since the equation is second order. They are sine and cosine.
y = sin (at) and y = cos (at). Two derivatives bring back sine and cosine with minus a^2.
The next step allows damping (first derivative) as in my'' + dy' + ky = 0. How to solve? Just try y = e^at. You find that ma^2 + da + k = 0. Two a's give two solutions.

### Course Description

Highlights of Calculus is a series of short videos that introduces the basics of calculus—how it works and why it is important. The intended audience is high school students, college students, or anyone who might need help understanding the subject.

The series is divided into three sections:
Introduction
- Why Professor Strang created these videos
- How to use the materials

Highlights of Calculus
- Five videos reviewing the key topics and ideas of calculus
- Applications to real-life situations and problems
- Additional summary slides and practice problems

Derivatives
- Twelve videos focused on differential calculus
- More applications to real-life situations and problems
- Additional summary slides and practice problems

Acknowledgements
Special thanks to Professor J.C. Nave for his help and advice on the development and recording of this program.The video editing was funded by the Lord Foundation of Massachusetts.