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# L09a - Physics 111 Lecture 9a"There is nothing like...

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1 / 7 Physics 111 Lecture 9a “There is nothing like returning to a place that remains unchanged to find the ways in which you yourself have altered.” –Nelson Mandela

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Torque Torque Question Equilibrium Question 2 / 7 When applying a force to a rotating object (e.g., opening a door), it is very important to understand where the force is being applied on the object The amount of rotation produced by a force on a rotating object is measured by the torque τ : τ = rF sin( θ ) = rF (1) where F is the magnitude of the force, r is the distance from the point where vector F is applied to the axis of rotation (or pivot point), and θ is the angle between vector F and vector r When vector F is parallel to vector r , τ is zero When vector F is at some angle θ , the perpendicular component of vector F is what causes the rotation The SI unit of torque is N m (not Joule)
Torque Torque Question Equilibrium Question 3 / 7 Just as force causes linear acceleration, torque causes angular acceleration

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