Question

10.
The frictional force acting between two bodies is
(1)
directly proportional to the normal reaction
(2)
inversely proportional to the normal reaction
(3)
directly proportional to mass
(4)
inversely proportional to mass​

Answer 1

Answer:

directly proportional to mass

Answer 2

(1)

directly proportional to the normal reaction

(3)

directly proportional to mass

Explanation:

We know that frictional force is given as:

$f=\mu.N$

where:

$\mu=$ coefficient of friction between the surfaces is a constant

$N=$ normal force of reaction due to weight of the body

$N=m.g$

$f=\mu.m.g$

m = mass of the body

g = acceleration due to gravity.

So,

$f\propto N$

$f\propto m$

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TOPIC: friction

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