Chapter 17 : Linear Motion „„„„„ 361

361

Linear Motion

Contents

1. Introduction.


2. Important Terms.


3. Motion Under Constant
   Acceleration.


4. Motion Under Force of
   Gravity.


5. Distance Travelled in the
   nth Second.


6. Graphical Representation
   of Velocity, Time and
   Distance Travelled by a
   Body.

17.1. INTRODUCTION

A body is said to be at rest, if it occupies the

same position with respect to its surroundings at all

moments. But it is said to be in motion, if it changes

its position, with respect to its surroundings.

17.2. IMPORTANT TERMS

The following terms, which will be frequently

used in this chapter, should be clearly understood at

this stage :

1. Speed. The speed of a body may be
   defined as its rate of change of
   displacement with respect to its
   surroundings. The speed of a body is
   irrespective of its direction and is, thus, a
   scalar quantity.

17

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