Ball on string orbits with increasing speed as string is shortened.
What it shows:
An object moving in a circular orbit of radius r has an angular momentum given by:
L = r × mv = mr2ω.
A simple way to show conservation of angular momentum is a ball on a string, whirled around your head. As you change the length of the string, the ball's orbital speed changes to conserve angular momentum.
How it works:
The orbiter consists of a meter length of cord with a wooden ball at one end and a wooden anchor at the other. The cord passes...
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