Coefficient of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction

Ratio of limiting friction and normal reaction

The friction force acting when the body is just about to move

The friction force acting when the body is in motion

The correct answer is `No. 2: Ratio of limiting friction and normal reaction`

The coefficient of friction is the ratio of limiting frictional force F to the normal reaction R between the two surfaces. It is denoted by µ.

µ = F/R

The coefficient of friction is of three types namely coefficient of static friction µ_s, coefficient of kinetic or dynamic friction µ_k, and coefficient of rolling friction µ_r.

(i) For the same two surfaces, µ_s > µ_k> µ_r

(ii) Limiting friction is the maximum value of static friction.

(iii) The force of friction always acts parallel to the surfaces in contact.

(iv) The force of friction F is equal to applied force if it is less than or equal to µ_r.

Coefficient of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction

Ratio of limiting friction and normal reaction

The friction force acting when the body is just about to move

The friction force acting when the body is in motion

The correct answer is `No. 2: Ratio of limiting friction and normal reaction`

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Coefficient of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction

Ratio of limiting friction and normal reaction

The friction force acting when the body is just about to move

The friction force acting when the body is in motion

The correct answer is No. 2: Ratio of limiting friction and normal reaction

The correct answer is `No. 2: Ratio of limiting friction and normal reaction`