Q.

A block of  mass 2Kg is kept on a rough horizontal surface. It is pulled by applying a horizontal force F μs=0.6 and μk=0.4i)  If F = 12 N, frictional force on the block is 7.84Nii)  If F = 10 N, frictional force on the block is 10 Niii)  If F = 7.84 N, frictional force on the block is zero

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a

i and ii are correct

b

ii and iii are correct

c

i and iii are correct

d

All are correct

answer is A.

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Detailed Solution

Minimum force required to move the bodyμsmg=0.6×2×9.8=1.2×9.8=11.76if F = 12 > 11.76   So frictional force = μkgm= 7.84 N.if F = 10 < 11.76  frictional force is 10 N.
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A block of  mass 2Kg is kept on a rough horizontal surface. It is pulled by applying a horizontal force F μs=0.6 and μk=0.4i)  If F = 12 N, frictional force on the block is 7.84Nii)  If F = 10 N, frictional force on the block is 10 Niii)  If F = 7.84 N, frictional force on the block is zero