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Rotational Motion Of Rigid Body - Practice Questions & MCQ

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

Quick Facts

  • 5 Questions around this concept.

Solve by difficulty

A metal coin of mass 5g and radius of 1 cm is fixed to a thin stick AB of negligible mass as shown in the figure . The system is initially at rest . the constant torque, that will make the system rotate about AB at 25 rotations per second in 5s, is closed to:

Concepts Covered - 1

Rigid body rotation
  • Rigid body-

It is defined as a system of particles in which the distance between each pair of particle remains constant.

This means the shape & size do not change during the motion.

  • Translation motion- 

If a body is moving such that a line drawn between any two of its internal points remain parallel to itself.

All the particles of the body move along parallel paths.

All the particles of the body follows 1 D motion.

Example- Motion of a body along a straight line.

  • Rotational motion-

A rigid body is said to be in pure rotation if every particle of the body moves in a circle and centre of all the circles lie on a straight line called the axis of rotation.

The line joining any two internal points does not remain parallel.

Example-motion of wheels, gears, motors.

  • Some important terms-

  1. System-

A system is a collection of any number of particles interacting with one another and are under observation for analysing the situation. 

  1.  Internal forces-

Internal forces are all the  forces exerted by various particles of the system on one another . Internal forces between two particles are equal in magnitude and opposite in direction.

  1. External forces-

External forces are the forces that we have to apply on the object/system from outside to move or stop an object/system.

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Rigid body rotation

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