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In our last lab we found that the “turning effect” depends on the force and the lever arm. r2 r1 F2 m2 g F1 m1g Clockwise Turning Effect Counterclockwise Turning Effect Turning Effect r F Where tau Torque the turning effect r= Lever arm - perpendicular distance from the axis of rotation to the point of application of the force. r F Torque the turning effect r F Where r = perpendicular distance from the axis of rotation to the point of application of the force. Units : N m Torque is a vector! Torques that would result in Counterclockwise rotation = + Torques that would result in Clockwise rotation = - Right Hand Rule – curl the fingers of your right hand in the direction of rotation. The vector is in the direction of your outstretched thumb. The object rotates around the torque vector. Torque the turning effect r F Where r = perpendicular distance from the axis of rotation to the point of application of the force. In all cases thus far, the force acted perpendicularly to the distance from the axis of rotation. Later, we will consider how much torque is applied when the force and the distance are not perpendicular.