4

Friction

INTRODUCTION

When a body slides over another body, a force is exerted at the surface of contact by the stationary body on the moving body. This resisting force is called the force of friction and acts in a direction opposite to the direction of motion. The property of the bodies by virtue of which a force is exerted by a stationary body on a moving body to resist the motion of the moving body is called friction. Friction acts parallel to the surface of contact and depends upon the nature of surface of contact.

TYPES OF FRICTION

Dry Friction

Dry friction is said to occur when there is relative motion between two completely unlubricated surfaces. It is further divided into two types:

  1. Solid friction: When the two surfaces have a sliding ...

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