If direction of r and f both changes then direction of torque remain unchanged.
How please somebody explain it.
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Part of the torque calculation is the determination of direction. The direction is perpendicular to both the radius from the axis and to the force. It is conventional to choose it in the right hand rule direction along the axis of rotation. ... In general, the change in angular velocity is in the direction of the torque.
How to determine the direction of torque
The direction of rotation can be clockwise (cw) or counterclockwise (ccw). ...
For example, a torque that rotates an object counterclockwise is a positive torque (see figure 6 below). ...
A torque that rotates an object clockwise is a negative torque (see figure 7 below
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