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Read each statement below carefully, and state, with reasons, if it is true or false;
A wheel moving down a perfectly frictionless
 inclined plane will undergo slipping (not rolling) motion.

True

The rolling occurs only on account of friction which is a tangential force capable of providing torque. When the inclined plane is perfectly smooth, the wheel will simply slip under the effect of its own weight. 
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 Read each statement below carefully, and state, with reasons, if it is true or false;
(d) For perfect rolling motion, work done against friction is zero.


True

The perfect rolling begins because the force of friction becomes zero. Hence work done against friction is zero.
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