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# 43_shm - Lesson 43 Simple Harmonic Motion As far back as...

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Lesson 43: Simple Harmonic Motion As far back as Lesson 31 we started talking about ideas like period and frequency, and more recently in Lesson 39 Hooke's Law. We can bring these ideas together now to look more carefully at the idea of Simple Harmonic Motion ( SHM ). Simple harmonic motion is any situation where an object... 1. repeats its motion over and over again in a fixed pattern that has a certain period. 2. there is a restoring force causing it to move back to its equilibrium point (where it was at rest before any force was applied to it). The restoring force is directly related to the amount of displacement from equilibrium (that's Hooke's Law). SHM happens to objects that are simple harmonic oscillators . If we look at situations where a mass is attached to an elastic object (like a spring), we can use our knowledge of the forces acting on it to start making predictions of how it will move. If the mass is stretched away from equilibrium, the restoring force will pull it back to equilibrium. The amount of restoring force would be calculated using F s = -kx. Besides the restoring force (calculated using Hooke's Law) you may have to take other forces into account.

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43_shm - Lesson 43 Simple Harmonic Motion As far back as...

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