Question

define force of friction List the factors affecting the force of friction explain with examples

Answer 1

friction force is a force which opposes the motion of an object
the magnitude of friction force depends upon the normal reaction, coefficient of friction and force acting on the body

Answer 2

The factors that affect friction are as follows:-

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. ... The factors which affect friction are: The weight of the objective.

Surface on which the object is moved or the nature of the surface. i.e., rough surface, smooth surface, liquids etc

The weight of the object or the amount of force on the surface by the object