BACHELOR OF SCIENCE Chapter Notes -Rotational Energy, Moment Of Inertia, Unit
12 Aug 2022
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Document Summary
Torque is a measure of the force that can cause an object to rotate about an axis. Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. Torque is measured in terms of newton meter (n-m). The law of conservation of angular momentum expresses that when no outside force follows up on an article, no difference in angular momentum will happen. Angular momentum of a system is preserved for however long there is no net external torque acting up on the system. A ballet dancer makes use of the law of conservation of angular momentum to vary her angular speed. When she suddenly folds her arms and brings the stretched leg close to the body, her angular velocity increases on account of the decrease in moment of inertia. This helps in rotating safely on her legs.
