Question

define coefficient of static friciton ans the angle of friction.

Answer 1

coefficient of static friction: the ratio of the force that maintains contact between an object and a surface and the frictional force that resists the change in the state of motion. the magnitude of coefficient of static friction is largeer than the coefficient of kinetic friction.

Angle of friction: It the angle which the resultant of the force of limiting friction (F) normal reaction (R) makes with the direction of normal reaction R.

$\mu =\tan \theta$