# lecture12 - Torque Torque in 2 and 3 dimensions Text...

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Physics 1D03 - Lecture 10 1 Torque Torque Text Sections : 10.6 Torque in 2 and 3 dimensions

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Physics 1D03 - Lecture 10 2 An unbalanced force applied to an object causes it to move (accelerate). F a Even with no net force, the object is not necessarily in equilibrium. A net torque will cause it to rotate. F -F Torque is what causes rotation
Physics 1D03 - Lecture 10 3 Quiz A weight W is placed at one end of a light plank. What weight should be placed at the other end so that the plank will balance on a pivot placed 1/3 of the way along the plank? a) 3W b) 2W c) W d) ½ W e) 1/3 W L/3 2L/3 W ?

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Physics 1D03 - Lecture 10 4 R F τ Each force produces a torque, (“tau”), which tends to rotate the plank about the pivot. Torque is proportional to the force and to the distance from the pivot: torque = (length of “lever”) x (force) (when the force is perpendicular to the “lever” – more complicated otherwise) rF =
5 A force directed toward the axis of rotation produces no torque. You cannot shut a door by pushing directly toward the hinges (F

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## This note was uploaded on 11/08/2010 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Spring '09 term at McMaster University.

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lecture12 - Torque Torque in 2 and 3 dimensions Text...

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