Question

an object of mass m held against a vertical wall by applying horizontal force F.The minimum value of force F is

Answer 1

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.