Rotational Force (Torque)

A rotational force, also known as a torque, depends upon the force and where that force is applied;

torque = lever arm x force.

The lever arm is the perpendicular distance from the force to the axis of rotation.

A "lever arm" is also known as a "moment arm".

Consider the torque exerted on this wrench by a force applied in different directions or in different places.





Consider the rotational force -- or the torque -- acting on a door when you try to open it by exerting a force in various places or in various directions.

Rotational Mass

Center of Mass

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(C) 2003, Doug Davis; all rights reserved