For a given mass,how does rolling friction compare to static friction and kinetic friction?

  • A
    Rolling friction is much smaller than both static and kinetic friction.
  • B
    Rolling friction is equal to static friction but smaller than kinetic friction.
  • C
    Rolling friction is greater than both static and kinetic friction.
  • D
    Rolling friction is equal to kinetic friction but smaller than static friction.

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Write the unit of the coefficient of static friction.

Block $B$ lying on a table weighs $W$. The coefficient of static friction between the block and the table is $\mu$. Assume that the cord between $B$ and the knot is horizontal. The maximum weight of the block $A$ for which the system will be stationary is

The coefficient of static friction,$\mu_s$,between block $A$ of mass $2\, kg$ and the table as shown in the figure is $0.2$. Find the maximum mass value of block $B$ in $kg$ so that the two blocks do not move. The string and the pulley are assumed to be smooth and massless. $(g = 10\, m/s^2)$

Impending relative motion is opposed by which type of friction?

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