Rotation 3 Question 5

11. A disc is rolling (without slipping) on a horizontal surface. C is its centre and Q and P are two points equidistant from C. Let vP,vQ and vC be the magnitude of velocities of points P,Q and C respectively, then

(2004)

(a) vQ>vC>vP

(b) vQ<vC<vP

(c) vQ=vP,vC=12vP

(d) $v _Qv _P$

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Answer:

Correct Answer: 11. (a)

Solution:

  1. In case of pure rolling bottom most point is the instantaneous centre of zero velocity.

Velocity of any point on the disc, v=rω, where r is the distance of point from O.

vQ>vC>vP

rQ>rC>rP



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