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Relative Velocity MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

  • Relative Velocity is considered one of the most asked concept.

  • 24 Questions around this concept.

Solve by difficulty

$A$ person $A$ is moving along east and $B$ is moving along north. Then relative velocity of $A$ with respect to $B$ is $\left(V_A=10 \mathrm{~m} / \mathrm{s}, V_B=10 \sqrt{3} \mathrm{~m} / \mathrm{s}\right)$

A particle is moving along a circular path with a constant speed of 10ms-1 . What is the magnitude of change in velocity of the particle, when it moves through an angle of 600 around the centre of the circle?

 

A container is kept in a moving bus.

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A bus is moving at a speed of 10ms-1 on a straight road. A scooterist wishes to overtake the bus in 100s. If the bus is at a distance of 1km from the scooterist, with what speed should the scooterist chase the bus?

A man ( mass=50 kg ) and his son ( mass=20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of $0.70 \mathrm{~ms}^{-1}$ with respect to the man. The speed of the man (in $\mathrm{m} / \mathrm{s}$ ) with respect to the surface is :

Ship A is moving west at a speed of  10\ km\ h^{-1}, and ship B is moving north at a speed of 100\ km south of A. The time at which the distance between them becomes shortest is:

Concepts Covered - 1

Relative Velocity
  • Relative change in position of one object with respect to another object.

  • Formula-

           Relative  velocity of object A with respect to object B .

                                            \vec{V}_{AB}= \vec{V}_A-\vec{V}_B

  • Case of Relative velocity

  1. When A and B are moving along a straight line in the same direction.

            \underset{V_A}{\rightarrow} = Velocity of object A.

            \underset{V_B}{\rightarrow} = Velocity of object B.

         Then, relative velocity  of A w.r.t B is

                            \vec{V}_{AB}=\vec{V}_{A}-\vec{V}_{B}

               \vec{V}_{AB},\vec{V}_{A},\vec{V}_{B}  all are in same direction. (If \vec{V}_{A}> \vec{V}_{B})

           And Relative velocity of B w.r.t A is

                            \vec{V}_{BA}=\vec{V}_{B}-\vec{V}_{A}

                        &  \vec{V}_{AB}=-\vec{V}_{BA} 

 

 

  1. When A & B are moving along with straight line in opposite direction.

          Relative velocity of A with respect to B is.

                                       \vec{V}_{AB}=\vec{V}_{A}-(-\vec{V}_{B})

                                       \vec{V}_{AB}=\vec{V}_{A}+(\vec{V}_{B})

 

       3. Relative Velocity when bodies moving at an angle to each other

  • Relative velocity of a body, A with respected body B 

            V_{AB}= \sqrt{V_{A}^{2}+V_{B}^{2}+2V_{A}V_{B}\cos \left ( 180-\theta \right )}

                      = \sqrt{V_{A}^{2}+V_{B}^{2}-2V_{A}V_{B}\cos \left ( \theta \right )}

 

Where, \\*V_{A}= velocity\: of\: A\\* V_{B}= velocity\: of\: B\\* \Theta = angle \: between \: A \: and \: B

  • If   \overrightarrow{V_{AB}}  makes an angle \beta with the direction of \overrightarrow{V_{A}}, then

                             \\*\tan \beta = \frac{V_{B}\sin \left ( 180-\Theta \right )}{V_{A}+V_{B}\cos \left ( 180-\Theta \right ) }\\*\\* = \frac{V_{B}\cdot \sin\Theta }{V_{A}-V_{B}\cos \Theta }

  • If two bodies are moving at right angles to each other.

           Relative Velocity of A with respect to B is

                                   V_{AB}=\sqrt{{V_{A}}^{2}+{V_{B}}^{2}}

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Relative Velocity

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