Question:

If torque is zero then:

Updated On: Jun 20, 2022

angular momentum is conserved
linear momentum is conserved
energy is conserved
angular momentum is not conserved

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The Correct Option is A

Solution and Explanation

Torque is the rate of change of angular momentum. That is,

\tau=\frac{d L}{d t}

If torque

(\tau)

is zero, then

\frac{d L}{d t}=0

L =

constant
i.e., angular momentum of the system is conserved.

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Concepts Used:

System of Particles and Rotational Motion

The system of particles refers to the extended body which is considered a rigid body most of the time for simple or easy understanding. A rigid body is a body with a perfectly definite and unchangeable shape.
The distance between the pair of particles in such a body does not replace or alter. Rotational motion can be described as the motion of a rigid body originates in such a manner that all of its particles move in a circle about an axis with a common angular velocity.
The few common examples of rotational motion are the motion of the blade of a windmill and periodic motion.