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.
HELICAL SPRINGS
Consider a closely-coiled helical springs whose upper end is fixed as shown in Fig 26.1.
HELICAL SPRINGS IN SERIES AND PARALLEL
SIMPLE PENDULUM
A simple pendulum, in its simplest form, consists of a heavy bob suspended at the end of a light inextensible, flexible string and the other end of the string is fixed at O as shown in Fig 26.4.
LAWS OF SIMPLE PENDULUM
