SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A uniform circular disc of radius  is placed on a rough horizontal surface and given a linear velocity  and angular velocity  as shown. The disc comes to rest moving some distance to the right. It follows that

a)

b)

c)

d)


Question ID - 100186 :-

A uniform circular disc of radius  is placed on a rough horizontal surface and given a linear velocity  and angular velocity  as shown. The disc comes to rest moving some distance to the right. It follows that

a)

b)

c)

d)

1 Answer
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Answer Key : (b) -

(b)

Since the disc comes to rest, it stops rotating and translating simultaneously  and . That means, the angular momentum about the instantaneous point of contact just after the time of stopping is zero. We know that the angular momentum of the disc about  remains contant because frictional force  and  pass through point  and thus produce no torque about this point



Next Question :

A man stands at one end of a boat which is stationary in water. Neglect water resistance. The man now moves to the other end of the boat and again becomes stationary. The centre of mass of the ‘man plus boat’ system will remain stationary with respect to water

a)

only when the man is stationary initially and finally

b)

only if the man moves without acceleration on the boat

c)

only if the man and the boat have equal masses

d)

in all cases


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