ch09 - Chapter 9 Rotational Dynamics 9.1 The Action of Forces and Torques on Rigid Objects In pure translational motion all points on an object travel

ch09 - Chapter 9 Rotational Dynamics 9.1 The Action of...

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Chapter 9 Rotational Dynamics
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9.1 The Action of Forces and Torques on Rigid ObjectsAccording to Newton’s second law, a net force causes anobject to have an acceleration.What causes an object to have an angular acceleration ?
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9.1 The Action of Forces and Torques on Rigid Objects
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9.1 The Action of Forces and Torques on Rigid Objects DEFINITION OF TORQUE Magnitude of Torque = (Magnitude of the force) x (Lever arm) F Direction: The torque is positive when the force tends to produce a counterclockwise rotation about the axis. SI Unit of Torque: newton x meter (N·m)
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9.2 Rigid Objects in Equilibrium If a rigid body is in equilibrium, neither its linear motion nor its rotational motion changes. 0 x F 0 y F 0 0 y x a a 0
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9.2 Rigid Objects in Equilibrium EQUILIBRIUM OF A RIGID BODY A rigid body is in equilibrium if it has zero translational acceleration and zero angular acceleration. In equilibrium, the sum of the externally applied forces is zero, and the sum of the externally applied torques is zero.
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