Chapter 27 : Collision of Elastic Bodies „„„„„ 553

553553

Contents

1. Introduction.


2. Phenomenon of Collision.


3. Law of Conservation of
   Momentum.


4. Newton’s law of Collision of
   Elastic Bodies.


5. Coefficient of Restitution.


6. Types of Collisions.


7. Direct Collision of Two Bodies.


8. Loss of Kinetic Energy During
   Collision.


9. Indirect Impact of Two Bodies.


10. Direct Impact of a Body with
    a Fixed Plane.


11. Indirect Impact of a Body
    with a Fixed Plane.

Collision of

27 Elastic Bodies

CHAPTERCHAPTERCHAPTERCHAPTERCHAPTER

27.1. INTRODUCTION

We daily see children playing with balls of

glass, rubber and other elastic materials. If we see

them carefully, we will find that if a glass ball is

allowed to fall on a marble floor, from a certain height,

it rebounds (i.e. rises up, after striking the floor) to a

certain height. This height is, generally, less than the

height from which the ball is allowed to fall. If the

same ball is allowed to fall on a wooden floor, then it

will rebound to a lesser height. We will also see that

if the balls of different materials are allowed to fall

on a marble floor, they will rebound to different

heights.

This property of bodies, by virtue of which,

they rebound, after impact, is called elasticity. It may