A disk falls freely from rest without rotation. Then the disk is used to make a

Question

A disk falls freely from rest without rotation. Then the disk is used to make a yo-yo by wrapping a light thread around its edge. The free end of the thread is kept fixed, while the yo-yo is released from rest and moves vertically down. In which case is the downward motion of the disk faster, after traveling the same vertical distance? a) The freely falling disk moves faster if the distance is short, but the yo-yo moves faster if given enough time. b) When falling freely. c) As a yo-yo. d) The speed is the same in both cases. E) it depends on the mass of the disk.

Explanation / Answer

d.) Same Speed in both cases.

In both the cases the distance covered is same.

When you hold a yo-yo in your hand, it has potential energy: it stores energy because it's high above the floor. When you release it, the potential energy is gradually converted into kinetic energy (the energy something has because it's moving). When a yo-yo is spinning at the bottom of its string, virtually all the potential energy it had originally has been converted into kinetic energy.

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