A block $B$ is pushed momentarily along a horizontal surface with an initial velocity $V$. If $\mu$ is the coefficient of sliding friction between $B$ and the surface, block $B$ will come to rest after a time [image:5_image102.emf]

Question

Dr. Abubacker · Accepted Answer

(a) Friction is the retarding force for the block
$F = ma = \mu R = \mu mg$
Retardation $a = \mu g$
From first equation to motion $v = u - at$
$\Rightarrow 0 = V - \mu g 	imes t \Rightarrow t = \frac{V}{g\mu}$

Q. A block $B$ is pushed momentarily along a horizontal surface with an initial velocity $V$. If $\mu$ is the coefficient of sliding friction between $B$ and the surface, block $B$ will come to rest after a time

Explanation

Reviewed by Dr. Abubacker

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