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J.M. Gabrielse Torque
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J.M. Gabrielse Outline fun with seesaws two little people a big person and a little person two little people in different spotstwo little people in different spots equationequation exampleexample
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J.M. Gabrielse What Will Happen? Nothing
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J.M. Gabrielse The Bigger Torque Wins In this case the torques are equal so they balance out.
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J.M. Gabrielse What Will Happen? Why?
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J.M. Gabrielse The Bigger Torque Wins The BIG FORCE creates a bigger torque than the little force. F F A force is a push or a pull.
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J.M. Gabrielse Why? What Will Happen?
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J.M. Gabrielse F F Both forces are the same size. The BIG DISTANCE from the pivot point creates a bigger torque than the little distance. The Bigger Torque Wins (pivot point = fulcrum)
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J.M. Gabrielse What Will Happen?
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J.M. Gabrielse The Bigger Torque will Win Which torque will be bigger? a little force with a BIG DISTANCE a BIG FORCE with a little distance F F
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J.M. Gabrielse T = F d Note: d is measured perpendicular to F distance Calculate Torque (T) F pivot point d force
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J.M. Gabrielse What Will Happen? F = 200 lb d = 10 F = 50 lb d = 70 in
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J.M. Gabrielse Use the Equation F = 200 lb d = 10 in T = 2000 in lb F = 50 lb d = 70 in T = 3500 in lb F F
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J.M. Gabrielse T = 2000 in lb T = 3500 in lb The Bigger Torque Wins
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J.M. Gabrielse d2d2 d1d1 Which arm has more torque on it? Arm 1 Arm 2 F 1 = 10 lbs F 2 = 10 lbs
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J.M. Gabrielse d2d2 d1d1 Which arm has more torque on it? Arm 1 Arm 2 F 1 = F 2 d 1 > d 2 - so - T 1 > T 2 F 1 = 10 lbs F 2 = 10 lbs
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J.M. Gabrielse Motors Provide Torque Torque from the motor makes the wheel spin. The maximum torque from a Vex motor is 6.5 in*lb.
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J.M. Gabrielse Motor Example How much torque would the motor need to supply? pivot point d = 15 in F = 0.225 lb motor T = F d = 0.225 lb x 15 in
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J.M. Gabrielse Motor Example How much torque would the motor need to supply? pivot point d = 15 in F = 0.225 lb motor T = 3.375 in lb
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J.M. Gabrielse Motor Example The motor has more than enough torque to lift a tube, but it also has to lift the weight of the arm. pivot point d = 15 in F = 0.225 lb motor
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J.M. Gabrielse Can’t loosen a screw?
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J.M. Gabrielse You need more TORQUE! Push harder (more force) -or- Use the long side of the allen wrench (longer distance)
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J.M. Gabrielse Two ways to hold an Allen wrench Speed: fastTorque: low Speed: slowTorque: high
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J.M. Gabrielse Use Torque to Tighten Screws Or your robot will end up like this!
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J.M. Gabrielse Resources http://www.education.rec.ri.cmu.edu/roboticscurri culum/vex_online/lessons/mechanics/torque/me chanics_torque.htmlhttp://www.education.rec.ri.cmu.edu/roboticscurri culum/vex_online/lessons/mechanics/torque/me chanics_torque.html Inventor’s Guide: 3·10
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