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?
9.1 The Action of Forces and Torques on Rigid Objects
9.1 The Action of Forces and Torques on Rigid ObjectsDEFINITION OF TORQUEMagnitude of Torque = (Magnitude of the force) x (Lever arm)FDirection: 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)
9.2 Rigid Objects in EquilibriumIf a rigid body is in equilibrium, neither its linear motion nor its rotational motion changes. 0xF0yF00yxaa0
9.2 Rigid Objects in EquilibriumEQUILIBRIUM OF A RIGID BODYA rigid body is in equilibrium if it has zero translationalacceleration and zero angular acceleration. In equilibrium,the sum of the externally applied forces is zero, and thesum of the externally applied torques is zero.