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Statics: Torque

Statics: Torque. What is torque Example Whiteboards. F. r. Angular Mechanics - Torque. Push farther out:. F. F. Push with more force:. Torque A twisting force. So how do you increase torque?. or. TOC. Angular Mechanics - Torque. F. r.

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Statics: Torque

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  1. Statics: Torque What is torque Example Whiteboards F r

  2. Angular Mechanics - Torque Push farther out: F F Push with more force: TorqueA twisting force So how do you increase torque? or TOC

  3. Angular Mechanics - Torque F r TorqueA twisting force that can cause an angular acceleration.  = rxF If r = .5 m, and F = 80 N, then  = (.5m)(80N)  = 40 mN. Torque is also in foot pounds (Torque Wrenches) TOC

  4. Angular Mechanics - Torque  TorqueA twisting force that can cause an angular acceleration. F  = rxF = rFsin Fsin r Only the perpendicular component gives rise to torque. (That’s why it’s sin) TOC

  5. Tough Example: What’s the torque here?  = 56o F = 16 N r = 24 cm Ok – This is as tricky as it can be: use  =rFsin, r = .24 m, F = 16 N But use not 56o. You want to use the angle between r and F which is 90 – 56 = 34o Finally,  = (.24 m)(16 N)sin(34o) = 2.1 mN TOC

  6. Whiteboards: Torque 1 | 2 | 3 TOC

  7. What is the torque when you have 25 N of force perpendicular 75 cm from the center of rotation? •  =rFsin • = (.75 m)(25 N) sin(90o) = 18.75 mN = 19 mN W 19 mN

  8. If you want 52.0 mN of torque, what force must you exert at an angle of 65.0o to the end of a .340 m long wrench? F 65o .340 m  =rFsin 52 mN = (.34 m)(F) sin(65o) F =(52mN)/((.34m) sin(65o))=168.75 N F = 169 N W 169 N

  9. The axle nut of a Volkswagen requires 200. foot pounds to loosen. How far out (in feet) do you stand on the horizontal wrench if you weigh 145 lbs?  =rFsin 200. ft lbs = (r)(145 lbs) sin(90o) r = (200. ft lbs)/(145 lbs) = 1.3793 feet r = 1.38 feet (1’ 41/2”) W 1.38 feet

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