- Oscillation – One complete to and fro motion of the bob of pendulum is called one oscillation.
- Amplitude – The maximum displacement of the bob from its mean position on either side, is called the amplitude of oscillation. It is denoted by the letter a or A and is measured in metre(m).
- Frequency – The number of oscillations made in one second is called the frequency. It is denoted by f or n. Its unit is per second (s-1) or hertz (Hz).
- Time period – The time taken to complete one oscillation is the time period. It is denoted by the symbol T. Its unit is in second (s).
