Acceleration - Practice Questions & MCQ

Definition: Rate of change of velocity with time.

• Tips for Acceleration-

1. The body is said to have undergone acceleration if there is a change in velocity i.e., :

   • Change in speed

   • Change  in direction

   • Change in both

2. It is a vector quantity

3. Dimension =

4. S.I unit = 

Example: A car starting from rest accelerates uniformly to a speed of 75 m/s in 12 seconds. What is the car's acceleration?

Solution:   0 (starting from rest)

                   75 m/s

 From the definition of acceleration we know that, 

                                                                                 a = 6.25 m/s²

There are four types of acceleration

• Average acceleration- Total change in velocity per unit time taken is the average acceleration

• Instantaneous acceleration - Infinitesimal change in velocity per unit time taken is the average acceleration

• Uniform acceleration- Change in velocity per unit time is constant.
• Non-uniform acceleration- Change in velocity per unit time is not constant.

Important terms related to acceleration:

•  Positive Acceleration-

 If the change in velocity is directed towards a positive direction (left to right) then acceleration is positive.

• Negative Acceleration-

 If the change in velocity is directed towards a negative direction (right to left) then acceleration is positive.

• Speeding up or acceleration

If the velocity and acceleration are directed in the same direction

• Slowing down or deceleration

If the velocity and acceleration are directed in the opposite direction