Rotational dynamics          due 4/4/00 9 am


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The following three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT EXERCISE button at the bottom of this page. 


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1.

Great Ramp Race! Suppose three objects of equal mass and radius are perched at the top of alarge ramp as shown in the figure. One object is a uniform disk, one is a hoop or ring, and one is a wheel for which nearly all of the mass is concentrated at the center (only a very small amount is in the spokes and the rim). If all are released from the same height at the same time, in what order will they reach the bottom of the ramp? Please explain your answer and your reasoning.

2.

Estimate the rotational kinetic energy of a figure skater doing a scratch spin (or any spin you like, if you don't know what a scratch spin is). Please state/explain your assumptions. Does your answer seem like a lot of energy to you?

3.

If you apply a net torque to a rigid object,

the angular momentum of the object will change.

the kinetic energy of the object will change.

the object will experience an angular acceleration.

the moment of inertia of the object will change.


You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT exercise button.