Chapter 24 : Laws of Motion „„„„„ 481

481

Laws of Motion

Contents

1. Introduction.


2. Important Terms.


3. Rigid Body.


4. Newton’s Laws of Motion.


5. Newton’s First Law of
   Motion.


6. Newton’s Second Law of
   Motion.


7. Absolute and Gravitational
   Units of Force.


8. Motion of a Lift.


9. D’Alembert’s Principle.


10. Newton’s Third Law of
    Motion.


11. Recoil of Gun.


12. Motion of a Boat.


13. Motion on an Inclined
    Planes.

24

CHAPTERCHAPTERCHAPTERCHAPTERCHAPTER

24.1. INTRODUCTION

The entire system of dynamics is based on three

laws of motion, which are the fundamental laws, and

were formulated by *Newton. Like other scientific

laws, these are also stated in the mathematical forms

which agree with actual observations.

24.2. IMPORTANT TERMS

The following terms, which will be mostly used

in this chapter, should be clearly understood at this

stage :

1. Mass. It is the matter contained in a body.
   The units of mass are kilogram, tonne etc.

• Named after Sir Issac Newton, who enunciated these
  laws in 1680.