Problem: Suppose you are standing on the center of a merry-go-round that is at rest. You are holding a spinning bicycle wheel over your head so that its rotation axis is pointing upward. The wheel is rotating counterclockwise when observed from above. For this problem, neglect any air resistance or friction between the merry-go-round and its foundation. Q. Suppose you now grab the edge of the wheel with your hand, stopping it from spinning. What happens to the merry-go-round? a. It remains at rest. b. It begins to rotate counterclockwise (as observed from above). c. It begins to rotate clockwise (as observed from above).

FREE Expert Solution

Assuming that there are no other factors such as air friction, heat, and sound, then the law of conservation of angular momentum and energy will hold. 

We also assume that there is sufficient friction between you and the surface of the merry-go-round, maintaining that everything else such as the axle and the wheel of the merry-go-round is frictionless. 

When you hold the spinning wheel, you apply a torque of equal magnitude but in the opposite direction, to the wheel, for it to completely stop from spinning. 

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Problem Details

Suppose you are standing on the center of a merry-go-round that is at rest. You are holding a spinning bicycle wheel over your head so that its rotation axis is pointing upward. The wheel is rotating counterclockwise when observed from above. 

For this problem, neglect any air resistance or friction between the merry-go-round and its foundation. Q. 

Suppose you now grab the edge of the wheel with your hand, stopping it from spinning. What happens to the merry-go-round? 

a. It remains at rest. 

b. It begins to rotate counterclockwise (as observed from above). 

c. It begins to rotate clockwise (as observed from above).

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the !! Conservation of Angular Momentum with Energy concept. If you need more !! Conservation of Angular Momentum with Energy practice, you can also practice !! Conservation of Angular Momentum with Energy practice problems.