“**Acceleration is the rate at which something changes its speed**“. It is the rate of change of velocity. It is the change of velocity per time. For example, if you are driving at 50 miles per hour and increase to 60 miles per hour, you have experienced an acceleration of 10 miles per hour per hour. If you are travelling at 100 miles per hour and increase to 110 miles per hour, you have experienced an acceleration of 10 miles per hour per hour.

- Unit of acceleration- m/s
^{2} - Dimension of acceleration- [L T
^{-2}]

- Average Acceleration
- Instantaneous Acceleration
- Uniform Acceleration
- Non-Uniform Acceleration

When the velocity of an object is changing at each instant of time, we can say that the velocity is changing with an average acceleration. The average acceleration of an object is a number which tells us the average rate of change of velocity of an object. The average acceleration of an object is the change in velocity of the object in a given time divided by the time.

The acceleration is measured as a change in velocity per unit time. However, acceleration is not measured at the same time that velocity is measured. The acceleration is measured at a much later time than the velocity is measured. When velocity is measured, the object may have already moved a significant distance. A common misconception is that the average acceleration is the same as the instantaneous acceleration but an object that is accelerating is not moving at a constant velocity. An object that is accelerating can be moving at any velocity.

Uniform acceleration refers to any constant acceleration which is independent of the mass of the object. The acceleration of an object with uniform acceleration is the same in magnitude regardless of the mass of the object. This acceleration is constant and is the same whenever the object is at the same height above the ground. The acceleration of an object with uniform acceleration is independent of the mass of the object. The acceleration of an object with uniform acceleration is the same in magnitude regardless of the mass of the object. This acceleration is constant and is the same whenever the object is at the same height above the ground. Something with a positive acceleration is speeding up, while something with a negative acceleration is slowing down.

Non-uniform acceleration is the phenomenon where the acceleration of an object varies depending on its position. The object undergoes different accelerations in different points of its path. The object may undergo acceleration in the positive direction, in the negative direction or in both directions. The acceleration can be constant during each interval or it can be changing during each interval. For example, the roller coaster undergoes acceleration in the positive direction while climbing the hill and in the negative direction while descending down. Acceleration is constant in the positive direction while climbing and in the negative direction while descending.

Velocity is the rate of change of displacement with respect to time while acceleration is the rate of change of velocity with respect to time. The velocity of an object is the rate at which the object moves but acceleration is the rate of change of velocity with respect to time. Velocity is a vector quantity both magnitude and direction are required to define it while acceleration is a scalar quantity only magnitude is required to define it. If a body is at rest, its velocity is zero. If the body moves with a constant velocity, its acceleration is zero. When the velocity of a body changes, the acceleration is not necessarily zero.

]]>The word velocity is derived from the Latin word “* velocitas*“.

Major difference between speed and velocity is that, speed is a scalar quantity which has only magnitude of velocity while velocity is a vector quantity which has both magnitude and direction.

**“Uniform velocity is the rate of change of the velocity of an object which has constant acceleration.”** The velocity of an object is the rate of change of the position of an object. In uniform velocity the velocity of an object must be constant. That is why the acceleration of an object must also be constant. So, in uniform velocity the acceleration of an object must be constant. The acceleration of an object is the rate of change of velocity of an object. Uniform velocity is the rate of change of velocity which is constant. So in uniform velocity the acceleration of an object must also be constant.

**“The average velocity is the distance travelled over a given time period divided by the time period.”**The average velocity of a body is equivalent to the average speed. Average velocity may change when the body changes the direction or the initial velocity changes. The average velocity is always positive. Average velocity is used for a single particle and for a system of particles. Average velocity is used to calculate the average velocity of a body if the average acceleration is known.

** Average velocity = (total distance)/(total time)**

**“The instantaneous velocity is the rate of change of an objects displacement with respect to time.”** The magnitude of the instantaneous velocity is the instantaneous speed. It is a vector quantity which has both magnitude and direction. Instantaneous velocity is usually denoted by a small letter “v”. The SI unit of instantaneous velocity is m/sec. It can also be calculated by taking slope of distance time graph. instantaneous velocity is calculated for an object under motion at an specific point of time.

**Instantaneous velocity = (final position – initial position)/time elapsed**

**“The non-uniform velocity is the rate of change of velocity of a body at a particular instant of time.”** It is the velocity at the end point of a given time interval. The non-uniform velocity is not a constant value. It is generally a function of time. The non-uniform velocity of a body depends on the magnitude and direction of the velocity as well as the velocity at the starting point. It is a vector quantity. It is a function of time and the magnitude of the velocity. It is the derivative of the velocity with respect to time. It is a measure of the rate of change of velocity with respect to time. The non-uniform velocity is the velocity at any instant of time.”