## Question: Define Oscillatory motion and the terms associated with oscillation.

### OSCILLATORY Motion

The repeated back and forth motion of a body about an equilibrium or mean position is called oscillatory motion.

In oscillatory motion the particle goes back and forth exactly over the same path in exactly the same way.

### DEFINITION OF SOME TERMS IN OSCILLATORY MOTION

Following are some terms frequently used in oscillatory motion.

• Cycle or vibration: One complete round trip of the vibrating object about the mean position is called one cycle or vibration.
• Time period: Time required to complete one cycle is called time period. It is denoted by T and its unit is second.
• Frequency: The number of cycles completed in one second is called frequency of oscillation. Its unit is cycles per second denoted by s-1 or hertz denoted by Hz.
• Displacement: The distance of the oscillator from the mean position at any instant of time is called displacement of the oscillator at that particular time. Its unit is meter (m).
• Amplitude: It is the maximum displacement of the oscillator from the mean position. Its unit is meter (m).

#### Relation between time period and frequency

Time period and frequency are reciprocals of each other. Therefore, T = 1/f or f = 1/T.