an object of mass m held against a vertical wall by applying horizontal force F.The minimum value of force F is
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Explanation:
ANSWER
Its the upward friction which holds the mass from falling downward as we know that the maximum value of friction is μN where N is normal reaction by Wall which is equal to Horizontal force F because horizontal force is balanced as no motion in horizontal direction.
Now to hold the weight the friction shoud have μN≥W
put N=F we get μF≥W or F≥
μ
W
asμ<1 so F>W.
Option c is correct.
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