- Waves are formed by a series of oscillation.
- In order to understand waves, we must understand oscillation.

### Technical Terms Related to Oscillation

- An equilibrium position is a point where an oscillating object experiences
**zero resultant forces**. - A complete oscillation occurs when the vibrating object:
- Amplitude is the maximum amplitude of an object from its equilibrium position. The SI unit for amplitude is meter, m.

- The greater the amplitude, the greater the mechanical energy possessed by the oscillating system.
- Period is defined as the time required for one complete oscillation or vibration .
- Frequency, f is the number of oscillation that take place in one second. The SI unit for frequency is Herz (Hz).
- Frequency can be related to period by the following equation
$$f=\frac{1}{T}$$

f = frequency

T = Period

**Example**:

Given that a pendulum makes 20 oscillations in 25s. Find the frequency of the pendulum.

**Answer**:

Period,

$$T=\frac{25s}{20}=1.25s$$

Frequency $$\begin{array}{l}f=\frac{1}{T}\\ f=\frac{1}{1.25}=0.8Hz\end{array}$$