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  4. 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 (in N ) acting on the block is ?

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Q. 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 (in $N$ ) acting on the block is ?

Laws of Motion

Solution:

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$F _{\text {external }} =5 \,N $
$f _{ r } =\mu mg $
$=.6 \times 1 \times 10=6 $
$ F _{\text {external }} < f _{ r } \text { (mass) }$
$ f _{ r } =5\, N $