**Acceleration Definition**

The rate of change of velocity with time is called acceleration.

Acceleration Formula

\(Acceleration (a)=\frac{\text { Change in velocity }(\Delta v)}{\text { Time interval }(\Delta t)}\)

## Acceleration | Definition, Types, Formulas, Units – Motion in a Straight Line

We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.

**Acceleration Units**

- Its SI unit is m/s².
- Its dimensional formula is [M°LT
^{-2}]. - It is a vector quantity.

Acceleration can be positive, zero or negative. **Positive acceleration** means velocity increasing with time, **zero acceleration** means velocity is uniform while **negative acceleration** (retardation) means velocity is decreasing with time.

**Uniform ****Acceleration Definition:**

If an object is moving with uniform acceleration, it means that the change in velocity is equal for equal interval of time.

**Non-uniform Acceleration Definition:**

If an object is moving with non-uniform acceleration, it means that the change in velocity is unequal for equal interval of time.

**Average Acceleration Definition:**

If a particle is accelerated for a time t_{1} with acceleration a_{1}, and for a time t_{2} with acceleration a_{2}, then average acceleration

\(a_{\mathrm{av}}=\frac{a_{1} t_{1}+a_{2} t_{2}}{t_{1}+t_{2}}\)

**Instantaneous Acceleration Definition:**

It is defined as the acceleration of object at any instant of time.

\(a_{\text {inst }}=\lim _{\Delta t \rightarrow 0} \frac{\Delta v}{\Delta t}=\frac{d v}{d t}\)

**Motion in a Straight Line Topics:**