A block of mass 1,kg lies on a horizontal surface in a truck. coefficient of static friction between

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4-2.Friction

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A block of mass $1\,kg$ lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is $0.6$ . If the acceleration of the truck is $5\,m\,s^{-2}$ . The frictional force acting on the block is ........ $N$

A

$10$

B

$5$

C

$2.5$

D

$20$

Solution

Limiting friction, $F=\mu \mathrm{mg}$

$=0.6 \times 1 \times 9.8$

$=5.88 \mathrm{N}$

Applied force, $F=\mathrm{ma}=1 \times 5=5 \mathrm{N}$

As $\mathrm{F}<\mathrm{f},$ so force of friction $=5 \mathrm{N}$

Standard 11

Physics

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