Acceleration is defined as the rate of change of velocity with respect to time. A body’s acceleration is the final result of all the forces being applied to the body, as defined by Newton’s second law. Acceleration is a vector quantity that is described as the frequency at which a body’s velocity changes. It is also the second derivative of position with respect to time or it is the first derivative of velocity with respect to time.

## SI unit and Formula

The S.I unit for acceleration is meter per second square or m/s^{2}.

Mathematically acceleration is denoted as

a= Change in velocity / Time taken

## Types

**Uniform acceleration**

When an object is travelling in a straight line with an increase in velocity at equal intervals of time, then the object is said to be in uniform acceleration. Free falling of an object is an example of uniform acceleration.

**Non-uniform acceleration**

When an object is travelling with an increase in velocity but not at the equal intervals of time is known as non-uniform acceleration. Bus moving or leaving from the bus stop is an example of non-uniform acceleration.

**Instantaneous acceleration**

Acceleration of an object at any instant of time is known as instantaneous acceleration.