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 ........ $N$
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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 $=5 \mathrm{N}$
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