A block of mass 1kg lies on horizontal surface in a truck. The coefficient of static friction between the block and the surface is μs=0.6. If the acceleration of the truck is 5m/s2, the friction force acting on the block is
A
4N
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B
5N
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C
6N
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D
7N
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Solution
The correct option is B5N Let us assume the truck has acceleration in the righttward direction. The FBD of the block in the frame of truck can be shown as
From the FBD we have N=1g=10N fmax=μN=10μ=10×0.6=6N
Applying the concept of pseudo force in the frame of truck,
the force on the block is ma=1×5=5N
Since, fmax>ma, the friction force acting over the block is f=ma=5N