1 Co-efficient of friction, Angle of friction, Cone of friction

Co-efficient of friction:

The magnitude of the limiting friction bears a constant ratio to the normal reaction between the two surfaces of contact and this ratio is called coefficient of friction.

Coefficient of friction, µ = F/N

Where F = Force of friction

               N = Normal reaction

Angle of friction:

At the contact surface, two reaction force of friction “F” and normal reaction “N” acts and combined graphically to get the reaction “R” which acts at angle “θ” called angle of friction.

tan θ = F/N = µ

Angle of limiting friction:

The angle between the resultant reaction and the normal reaction to the plane on which the motion of the body is impending.

tan α = F/N = µ

Angle of repose:

The maximum inclination of the plane on which a body, free from external forces, can repose is called angle of repose.

tan ø = F/N

Cone of friction:

The inverted cone with semi central angle “α” equal to limiting frictional angle “α”, is called cone of friction.