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    Acceleration - Practice Questions & MCQ

    Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

    Quick Facts

    • 40 Questions around this concept.

    Solve by difficulty

    The displacement vs time graph is given below which of the following conclusions is correct?

    A car moving with 72 km/hr comes to rest in 5 second its acceleration is: (in m/s2)

    A particle is moving eastwards with a velocity of  5 m/s. In 10 s the velocity changes to 5 m/s northwards. The average acceleration in this time is

    Match the following for the acceleration of a moving particle 

    P) Velocity increasing with time        1) zero 

    Q ) Velocity decreasing with time       2) positive 

    R )Velocity  constant with time            3) Negative  

    A car starts from rest. Its velocity after 5 sec is 10 m/s then the average acceleration of the car is :

    Direction: In the following question, a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as :

    Assertion: A body can have acceleration even if its velocity is zero at a given instant in time 

    Reason: A body is momentarily at rest when it reverses its direction of motion 

     

    If the body is moving along the x-axis with an initial velocity equal to 2 m/s is accelerated to a final velocity of -6 m/s in 2 seconds. The average acceleration of the body is?

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    If x denotes displacement in x and x=a cost, then acceleration is :

    The position, velocity and acceleration of a particle moving with constant acceleration can be represented by :

     

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    Starting from rest, the acceleration of a particle is a=2(t-1). The velocity of the particle at t=5s is:

    Concepts Covered - 1

    Acceleration
    1. Definition: Rate of change of velocity with time.

      $$
      \vec{a}=\frac{\text { change in velocity }}{\text { time taken }}=\frac{\vec{v}_f-\vec{v}_i}{t}
      $$

      - 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 $=L T^{-2}$
      4. S.I unit $=m \mathrm{~s}^{-2}$

      Example: A car starting from rest accelerates uniformly to a speed of $75 \mathrm{~m} / \mathrm{s}$ in 12 seconds. What is the car's acceleration?
      Solution: $v_i=0$ (starting from rest)

      $$
      v_f=75 \mathrm{~m} / \mathrm{s}
      $$


      From the definition of acceleration we know that,

      $$
      \begin{aligned}
      a & =\frac{v_f-v_i}{t} \\
      & =\frac{75-0}{12}
      \end{aligned}
      $$
       

                                             

      $$
      \mathrm{a}=6.25 \mathrm{~m} / \mathrm{s}^2
      $$


      There are four types of acceleration
      - Average acceleration- Total change in velocity per unit time taken is the average acceleration

      $$
      \text { Avg. acceleration }\left(\vec{a}_{a v g}\right)=\frac{\Delta \vec{v}}{\Delta t}
      $$

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

      $$
      \text { Inst. acceleration }\left(\vec{a}_{\text {inst }}\right)=\frac{d \vec{v}}{d t}
      $$
       

    2. Uniform acceleration- Change in velocity per unit time is constant.
    3. Non-uniform acceleration- Change in velocity per unit time is not constant. If the velocity and acceleration are directed in the opposite direction
    • Slowing down or deceleration  If the change in velocity is directed towards a negative direction (right to left) then acceleration is positive.
    • Speeding up or acceleration If the change in velocity is directed towards a positive direction (left to right) then acceleration is positive.
    • Negative Acceleration- Important terms related to acceleration.

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    Acceleration

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