Question

A wheel F on an axle is free to rotate about a horizontal axis, as shown in the figure.

String S has a loop on one end, which is hooked over peg P on the axle. The string is wound several times around the axle and has a weight W attached to the other end.
W is released and accelerates downwards. The string comes off the peg just as W reaches the ground.
What happens to the kinetic energy of F after W hits the ground?

Answer 1

Answer:

the wheel will continue to move with same kinetic energy if we ignore all resistive forces here

But if we consider all friction forces then the wheel will comes to rest after some time and its kinetic energy will decrease continuously

Explanation:

As we know that the wheel is rotating on the horizontal axis

Initially the weight is connected by the string to the wheel so when the weight is accelerating downwards then the wheel along with the weight will accelerate.

Now when the weight W will hit the ground then the string will released from the peg and there is no force on the wheel which will rotate it

So the wheel will continue to move with same kinetic energy if we ignore all resistive forces here

But if we consider all friction forces then the wheel will comes to rest after some time and its kinetic energy will decrease continuously

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Topic : Work Energy relation

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