Question

The force of friction (F) is equal to a) μN/2 b) μN c) 2μN d) μN/3

Answer 1

Answer :

• Force of Friction is equal to (a) μN

Explanation :

If a body is moving there will be presence of some frictional force, it is always opposite to the direction of the motion of the object.

Now, A.T.Q,

• The frictional force is always directly proportional to the normal reaction on Normal Force, denoted by either N or R. It is opposite in direction of the frictional force.

$\longrightarrow \sf{f \: \propto \: N}$

Where,

• f is frictional force
• N is normal reaction
• And directly proportional means if frictional force increases, then normal reaction also increases.

$\longrightarrow \sf{f \: = \: \mu N}$

After we remove the proportionality symbol there comes a constant which is known as Coefficient of friction. It is denoted by mu symbol (μ).

Answer 2

Answer:

The frictional force is always directly proportional to the normal reaction on Normal Force, denoted by either N or R. It is opposite in direction of the frictional force.

\longrightarrow \sf{f \: \propto \: N}⟶f∝N

Where,

f is frictional force

N is normal reaction

And directly proportional means if frictional force increases, then normal reaction also increases.

\longrightarrow \sf{f \: = \: \mu N}⟶f=μN

After we remove the proportionality symbol there comes a constant which is known as Coefficient of friction. It is denoted by mu symbol (μ).