Acceleration MCQ - Practice Questions with Answers

• Rate of change of velocity with time.

• Formula-

              a=change in velocity/change in time

                  $a=\frac{v_f-v_i}{t}$

• Tips for Acceleration-

1. It is a vector quantity

2. Dimension = $L{T}^{-2}$

3. S.I unit =  $m{s}^{-2}$

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

$\begin{array}{rl}& v_i=0\\ & v_f=75\mathrm{m}/\mathrm{s}\\ & a=?a=\frac{v_f-v_i}{t}\\ & =\frac{75-0}{12}\\ & a=6.25\mathrm{m}/{\mathrm{s}}^2\end{array}$

• Types for Acceleration

based on the nature of acceleration

                  There are three types of acceleration

1.  Positive Acceleration-

•  If the final velocity is greater than the initial velocity.  For:  V₂ > V₁

• E.g.- When a bus speeds up.

2.     Negative Acceleration-

• When the final velocity is less than the initial velocity. For: $V_1>V_2$

• Example- When a bus slows down.

3.     Zero Acceleration-

• When the final velocity is equal to the initial velocity. For:  $V_1=V_2$

• E.g.- When a bus is moving with uniform velocity.