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A disc is rotated about its axis with a certain angular velocity and lowered gently on a rough 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


Question ID - 100366 | Top Ranker Answer | SaraNextGen

A disc is rotated about its axis with a certain angular velocity and lowered gently on a rough 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 - 5876 Votes

3537

Answer Key : (a) -

(a)

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



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