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# Lecture-15 - Rotational RotationalDynamics Lecture#15...

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Rotational Dynamics L t #15 Ch 9 1 9 3 Lecture #15 – Ch. 9.1 – 9.3 Physics 125 – Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] Office Hours: 2:00 4:00 / Mon & Tue in Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Torque In rotational (angular) motion, (vector)Torque ( ) is the physical quantity that makes an object have (vector) Angular Acceleration. τ G Torque (about an axis of rotation) is the product between the Force (causing the rotation), the Distance (from the axis of rotation to the point of application of the force) and the Sine of the Angle between the line colinear with the Force vector (called Line of Action) and the line along which the Distance is measured. θ F d ( ) sin Fd τ θ = axis of rotation
Torque There are two relatively convenient ways to calculate Torque First One: Torque is the product between the magnitude of the Force and the Perpendicular Distance from the Axis of Rotation to the Line of Action - called the Lever Arm ( ). A F Fd τ = = A d d = A = d

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Lecture-15 - Rotational RotationalDynamics Lecture#15...

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