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Questions  

A rectangular body is held at rest by pressing it against a vertical wall for which μ < l. Which of the following is generally true?

 

a
It will be easier to hold the body if the surfaces in contact are smooth.
b
Pressing force required is smaller than weight rng of the body
c
Pressing force required is greater than weight mg of the body
d
The required pressing force is independent of coefficient of friction between surfaces in contact.

detailed solution

Correct option is C

f = MgF < f1Mg < μF                  ⇒ f > Mgμ>Mg

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