Torque:
The turning effect of a force about a certain point is called torque. Torque is the resultant of cross product between position vector of the point of application of the force and the force. It is a vector quantity. In SI units, the unit of torque is N-m. Conventionally clockwise torque is taken as negative and anti clockwise torque is taken as positive. When direction of both r and F are reversed then torque, does not change. In rotational motion, the torque is equal to rate of change of angular momentum. It the body is at rest or rotating with uniform angular velocity, the angular acceleration will be zero. In this case the torque acting on the body will be zero.
Moment Arm:
The perpendicular distance between the line of action of force and the axis of rotation is called moment arm.
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