Homework 6. Conservation of Angular Momentum

Name: ________________________ Due 10/10 ID Number: ________________________

Once started, a rotating object continues rotating unless slowed down or sped up by an external force. This is an example of the conservation of angular momentum. An object's angular momentum, symbolized by J, is proportional to its mass, its speed of rotation (measured in units such as m/s), and its radius (measured as distance from the axis of rotation). Conservation of angular momentum means that J does not change unless an external force acts on the object.

1. Give two examples of the conservation of angular momentum in everyday life. Chose one example in which the speed is constant, and one example in which it changes. It's probably a good idea to make a rough sketch of each example (don't worry about artistic ability, just try to show what's going on).




































(over)

2. Give two examples of the conservation of angular momentum in astronomy. Again, chose one example in which the speed is constant, and one example in which it changes, and make a rough sketch of each example.


















































Joshua E. Barnes (barnes@ifa.hawaii.edu)
Last modified: September 25, 2006
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