KVPY SX SB Exam 19-Nov-2017 Question Paper

Question : 36 of 120

Marks: +1, -0

A small ring is rolling without slipping on the circumference of a large bowl as shown in the figure. The ring is moving down at

P_1

, comes down to the lower most point

P_2

and is climbing up at

P_3

. Let

v↖{→}_\CM

denote the velocity of the centre of mass of the ring. Choose the correct statement regarding the frictional force on the ring.

It is opposite to $v↖{→}_\CM$ at the points $P_1, P_2 \andP_3.$
It is opposite to $v↖{→}_\CM$ at $P_1$ and in the same direction as $v↖{→}_\CM$ at $P_3.$
It is in the same direction as $v↖{→}_\CM$ at $P_1$ and opposite to $v↖{→}_\CM$ at $P_3$ .
It is zero at the points $P_1, P_2 \and P_3$

Solution:

_1

will increase ω.
fr

_3

will decrease ω

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