TIME AND MOTION-REVISION

A motion which repeats itself at regular intervals of time is called periodic motion

common device : Simple Pendulum

A simple pendulum consists of a metal bob suspended by a long thread from a rigid support

Motion of pendulum was first studied by GALILEO

Length : the length of the string from point of suspension to the centre of bob

Mean Position of the bob: The position of the bob when it is at rest

Oscillation of the pendulum: One complete to and fro motion of the bob about its mean position

Amplitude of the pendulum: The maximum displacement of the bob from its mean position on either side

Time Period: The time taken by the bob of a pendulum to complete one oscillation

Frequency of the pendulum: The number of oscillations made by a pendulum in one second

 $\frac{\frac{1}{time\ period\ \left[T\right]}}{ }$  = Frequency