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Unformatted text preview: 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 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...
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This note was uploaded on 04/22/2008 for the course PHYS 111 taught by Professor Madrid during the Winter '08 term at Ohio State.
 Winter '08
 Madrid
 Force

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