Introduction to friction and Laws of friction

This is a presentation on friction, its introduction and laws of friction.

Source:
https://amzn.to/3XAfzkV

A Textbook Of Engineering Mechanics by R. S. Khurmi
Paperback – 1 January 2018

1. Dr. PARESH GUJARATI Friction

2. introduction Friction is a resistance to the motion of one body over another body Frictional force always acts in a opposite direction to the motion The force required to initiate the sliding is called as STATIC FRICTION and that required to maintain the sliding motion is called KINETIC FRICTION P W F N

3. Introduction

4. Coefficient of friction, µ It is an indicative ratio of frictional force to the normal reaction It is a measure of roughness of a surface For example, coefficient of friction of CARPET is higher than that of ICE µ s > µ k

5. LAWS OF FRICTION Law 1 Frictional force is always in opposite direction to the motion Law 2 When applied force to the stationary body is less than the limiting force of friction, the body does not move. To move the body, the applied force should be more than the limiting force of friction Law 3 Frictional force is proportional to the normal load P F

6. Laws of friction Law 4 The frictional force is independent of apparent area of contact but is dependent on real contact area Law 5 The kinetic friction is independent of sliding velocity