A box of mass 8 kg is placed on a rough inclined plane of inclination 30°. Its downward motion can be prevented by applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum, is
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a
803 N
b
403 N
c
403 N
d
803 N
answer is A.
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Detailed Solution
For friction to be minimum,F cosθ = mg sinθ⇒ F = mg tanθ = 8×10×tan300 = 803 N
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A box of mass 8 kg is placed on a rough inclined plane of inclination 30°. Its downward motion can be prevented by applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum, is