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06-10-10 - Wednesday October-06-10 Thursday October 14 7:00...

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Wednesday, October-06-10 - Thursday, October 14: 7:00 – 8:20 - All material up to and including torque, moment of inertia, and rotational dynamics. - 9 – multiple choice, 4 problems or short questions - Next mid-term : Thursday, Nov 18 th 7 -9:00 o Torque ( 10.6, 11.1) Torque is what causes rotation An unbalanced force applied to an object causes it to move The amount of torque utilized is dependent on where you put the force upon Question 1 the answer is D Figure 1.1.1 Each force produces a torque (tau), which tends to rotate the plank above the pivot A force directed toward the axis of rotation produces no torque o Example if you push towards a door and its hinges parallel to the hinges won’t create any torque, but perpendicular to the hinge it will. o Figure 1.1.2 So therefore torque is equal to the perpendicular force x distance Torque = (F parallel )*(Distance) F parallel = F * sin( theta ) Shortest distance from pivot to line of action is the “effective lever arm”. If force

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