Rotational Inertia and Torque

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Presentation transcript:

Rotational Inertia and Torque “Rollin, Rollin, Rollin”

Rotational Inertia Dfn:Resistance of a body to rotational motion; Resistance to a change in spin. Depends both on the mass and location of the mass on the object. Bodies with more mass nearer the axis of rotation have a lower rotational inertia.

Torque Dfn: A force that causes a change in spin; vector; Newton meter Lever arm: distance between where force is applied and spin axis Torque directly depends on the magnitude of force perpendicular to the lever arm and length of the lever arm

Rotation Rotation occurs when torques are not balanced. That is, when there is a net torque on an object. Angular Acceleration = Torque / Rotational Inertia (Newton’s 2nd Law Applied to Rotation).

Angular Momentum We go round and round and round and round and round and round and round and round

Angular Momentum Dfn: Measurement of the amount of spin an object has; vector; kg m m rev/ sec. L = I w Direction determined using the right hand rule

Conservation of Angular Momentum The angular momentum of a closed system remains constant if no outside torques are exerted. When angular momentum is conserved, both the rotational speed and the direction of the spin axis remains constant.