(^528) „„„„„ A Textbook of Engineering Mechanics
528528

Helical Springs

and Pendulums 26

CHAPTERCHAPTERCHAPTERCHAPTERCHAPTER

Contents

1. Introduction.


2. Helical Springs.


3. Helical Springs in Series and
   Parallel.


4. Simple Pendulum.


5. Laws of Simple Pendulum.


6. Gain or Loss in the No. of
   Oscillations due to Change in
   the Length of String or
   Acceleration due to Gravity
   of a Simple Pendulum.


7. Gain or Loss in the No. of
   Oscillations due to Change in
   the Position of a Simple
   Pendulum.


8. Compound Pendulum.


9. Centre of Oscillation (or
   Centre of Percussion).


10. Conical Pendulum.

26.1. INTRODUCTION

We have already discussed in chapter 23 the

simple harmonic motion of bodies without any

reference to the force causing such a motion. But in

this chapter, we shall discuss the forces causing simple

harmonic motion of the following bodies :

1. Helical springs,


2. Simple pendulum,


3. Compound pendulum, and


4. Conical pendulum.

26.2. HELICAL SPRINGS

Consider a closely-coiled helical springs whose

upper end is fixed as shown in Fig 26.1.