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# p111_lecture17 - Chapter 9 Rotational Dynamics 9.2 Rigid...

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Chapter 9 Rotational Dynamics

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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 = !
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. ! = 0 " ! = 0 y F 0 = ! x F

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Rigid Objects in Equilibrium Reasoning Strategy 1. Select the object to which the equations for equilibrium are to be applied. 2. Draw a free-body diagram that shows all of the external forces acting on the object. 3. Choose a convenient set of x , y axes and resolve all forces into components that lie along these axes. 4. Apply the equations that specify the balance of forces at equilibrium. (Set the net force in the x and y directions equal to zero.) 5. Select a convenient axis of rotation.
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## This note was uploaded on 06/03/2011 for the course PHY 111 taught by Professor Bolland during the Fall '10 term at Ohio State.

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p111_lecture17 - Chapter 9 Rotational Dynamics 9.2 Rigid...

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