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Simple Harmonic Motion

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1. Definition
2. Experiment

Definition

Simple Harmonic Motion (SHM). The motion that occurs when an object is accelerated towards a mid-point. The size of the acceleration is dependent upon the distance of the object from the mid-point. Very common type of motion, eg. sea waves, pendulums, springs

Experiments

We placed a test tube in a container of water and stabilised the test tube by holding a pen inside it. The test tube was able to bob up and down in the water. The motion of the test tube was SHM.
We tied a piece of soap (we couldn't find any cheese) to a sink plug chain (the plug had long since gone) and swung it to and fro. Wow - it's a pendulum. The bob (the soap in this case) follows SHM
Found a pump with a handle. When we shone the overhead projector at the pump handle it made a shadow on the screen. The shadow of the handle moved up and down on the screen according to SHM if we were turning the handle at a constant speed.