What to do: Hold the bicycle wheel by the shaft with both hands, one on each sid
ID: 3307786 • Letter: W
Question
What to do: Hold the bicycle wheel by the shaft with both hands, one on each side of the wheel. Have your partner give it a good twist to set it spinning. Slowly let go of one end of the shaft, allowing the other hand to take the entire weight of the spinning wheel You will notice that the wheel will pull sideways, this is called precession. Let your body follow the precession of the wheel (don't fight the precession) and you'll find that the wheel will not "fall down". Questions: Does the wheel have any net kinetic energy while it is spinning? Is it conserved? Justify your answer. 1. 2. Does the wheel have any net momentum while it is spinning? Is it conserved? Justify your answer 3. Describe what happens to the precession as the spinning wheel slows down.Explanation / Answer
1. The wheel has rotataionla Kinetic energy as it spins. The KE is not conserved as it looses KE to friction by the hand and it slows down at some point.
2. The whell has angular momnetum as it spins around it s axis. The angular momnetum is not conserved as the wheel slows down due to friction from hand.
3. When one hand is removed the weight of the body acts downward from the COM and the reaction at the other hand acts upward and the wheel axel is ubjected to a troque and the wheel precess about the horizontal axis.
The precession rate is related to the spin rate and as the wheel slows down the spin rate dcreases and also the precession rate.
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