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A disc is rotated about its axis with a certain angular velocity and lowered gently on an inclined plane as shown in Figure, then

(A) It will rotate at the position where it was placed and then will move downwards 

(B) It will go downwards just after it is lowered 

(C) It will go downwards first and then climb up 

(D) It will climb upwards and then move downwards

1 Answer

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Correct option (A) It will rotate at the position where it was placed and then will move downwards

Explanation: 

Here kinetic friction force will balance will balance the force of gravity. So it will rotate at its intial position and will not move up or down. As its angular velocity becomes zero (friction also becomes zero), it will move downwrds.

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