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?

Moderate

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.

Solution

$f = Mg$
$F < f_{1}$
Mg < $μF \Rightarrow f > \frac{Mg}{μ} > Mg$

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