Torque

 Torque

Photo by Glenn Hansen on Unsplash

Introduction : We have seen small children playing top (bhawra) which rotates for some time when given a force. Similarly any rotational motion is associated with some force called as torque. Any object performing rotational motion require a rotational force. This torque is a rotational analogous of force. The force has the ability to produce turning effect or rotational motion for point mass. We will learn more in this topic.

Torque : The ability of a force to produce rotational motion is measured by its turning effect is called moment of force (torque).

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Mathematical Expression

Consider a rigid body free to rotate about an axis passing through a point 'O' and perpendicular to plane of rotation shown in fig. Force 'f' is applied at point P and 'r' is the perpendicular distance between axis of rotation and line of action of force.

τ = f x r

τ = f x r sin θ

where,

τ = torque

f = force applied

r = position vector

Try this experiment on your own.

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