Which one of the following statements is incorrect? 

  • [NEET 2018]
  • A

    Rolling friction is smaller than sliding friction.

  • B

    Limiting value of static friction is directly proportional to normal reaction.

  • C

    Coefficient of sliding friction has dimensions of length.

  • D

    Frictional force opposes the relative motion.

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Which of the following statements is not true

With what minimum velocity should block be projected from left end $A$ towards end $B$ such that it reaches the other end $B$ of conveyer belt moving with constant velocity $v$. Friction coefficient between block and belt is $\mu$ .

A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is $0.25$, then the maximum fraction of length of the chain, that can hang over one edge of the table is ...... $\%$

  • [AIPMT 1991]

In the diagram, $BAC$ is a rigid fixed rough wire and angle $BAC$ is $60^o$. $P$ and $Q$ are two identical rings of mass $m$ connected by a light elastic string of natural length $2a$ and elastic constant $\frac{mg}{a}$. If $P$ and $Q$ are in equilibrium when $PA = AQ = 3a$ then the least coefficient of friction between the ring and the wire is $\mu$. Then value of $\mu + \sqrt 3 $ is :-