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# Torque - Torque Rolling and Angular momentum PHYS116A02...

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Torque, Rolling and Angular momentum PHYS-116A-02, 10/12/10,  Lecture 14 Momchil Velkovsky

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The vector product
Torque A force applied at a right angle to a lever will generate a torque. The distance from the pivot to the point of force application will be linearly proportional to the torque produced.

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F 1 F 2 F 3 F 4 O The four forces shown all have the same magnitude: F 1 = F 2 = F 3 = F 4 . Which force produces the greatest torque about the point O (marked by the blue dot)? 1 2 3 4 5 0% 0% 0% 0% 0% 1. F 1 2. F 2 3. F 3 4. F 4 5. not enough information given  to decide
Lines of force and calculations of torques The directions of torques produced will give us another opportunity to apply the right-hand rule (RHR).

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What is the torque that this force applies about the origin? 1 2 3 4 5 20% 20% 20% 20% 20% ( 29 g ˆ ˆ 24 18 N m i + j ( 29 - - g ˆ ˆ 24 18 N m i j ( 29 - g ˆ ˆ 18 24 N m i + j ( 29 - - g ˆ ˆ 18 24 N m i j A force ( 29 + r ˆ ˆ 4 3 N F = i j acts an object at a point ( 29 r ˆ 6 m. r = k located at the position 1. zero 2.   3.   4.   5.
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Torque - Torque Rolling and Angular momentum PHYS116A02...

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