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Torque. Center of Gravity The point at which all the weight is considered to be concentrated The point at which an object can be lifted w/o producing.

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Presentation on theme: "Torque. Center of Gravity The point at which all the weight is considered to be concentrated The point at which an object can be lifted w/o producing."— Presentation transcript:

1 Torque

2 Center of Gravity The point at which all the weight is considered to be concentrated The point at which an object can be lifted w/o producing rotation

3 Center of Gravity In asymmetric objects, the center of gravity may not be the geometric center

4 Translational Equilibrium Occurs when an object is not accelerating

5 Rotational Equilibrium Occurs when an object is not rotating or the rotation is uniform

6 Torque The rotational effect of an object produced by a net force that is not applied to the center of gravity

7 WAWA WBWB A B C Torque arm C = Pivot Point or Center of rotation FTFT

8 Pivot Point Reference point from which to measure rotational forces

9 Torque Arm The length between the pivot point and the point where a force is applied

10 Torque The product of the applied force and the length of its torque arm:

11 WAWA WBWB A B C Torque arm 6 m 4 m FTFT Torque A = W A x 6 m Torque B = W B x 4 m

12 Torque Arm A WAWA WBWB Torque Arm B A B Torque A = W A Acos  Torque B = W B Bcos    FTFT

13 FAFA FNFN  F N = F A sin   l sin  Torque =F A l sin 

14 Calculate the torque on a 250 cm rod with a pivot point at one end and a 500.0 g object sitting on the other end

15 A person ties a rope to one end of a 10.0 m I- beam & tries lift it by pulling with 2500 N at 37 o from horizontal


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