. What is Torque


Best Answer

 we defined torque as the product of force and force arm. Force arm is the perpendicular distance from the axis to the line of action of force.

arm

The direction of torque can be inferred from the nut and spanner imagery described below. When you have to find the direction of torque, then you proceed like this. Imagine a nut kept at the point about which the torque is to be found.

spanner

Say we have to find the torque about the point C due to T1 in fig. (a). Then we imagine a nut kept at C as shown in fig. (b). It is clearly evident that T1 will rotate the spanner clockwise, hence torque due to T1 about C is clockwise. If it is torque due to T2 at C, then fig. (c) illustrates the imagery.

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