Question

A force of 165 N is just sufficient to slide a metal block over a wooden table. If the coefficient
of limiting friction is 0.30, what is the weight of metal block?
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Answer 1

Answer:

49.50 is the weight of metal block

Answer 2

Force just sufficient to slide the block = 165N

This force is also the limiting value of friction which is what we call fmax

now given, coefficient of limiting friction = 0.30

We know,

f = (mu) N

165 = 0.30 N

165/0.30 = N

550 = N

Since the floor is horizontal,

So N = Weight

So, the weight of the body is 550N

Cheers!