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Question

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/s2, the frictional force acting on the block in newtons is: (take g=10 ms2)

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Solution

Maximum friction =μmg=0.6×10×1=6 N
Pseudo force =ma=5 N
so required frictional force is only 5 N, although maximum frictional force available is 6 N.

So, the frictional force acting on the block is 5 N

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