Question

when the direction of r and f reverse​

Answer 1

Answer:

You should define your variables. I think we all know that F is a vector pointing in the direction of the force. However, R is typically not the variable used for a vector in this situation (typically r is used), and r refers to the vector from the axis to the point where the Force is applied - therefore “reversing the direction of R” confuses the issue.

However, it is clear that the torque is given by the vector equation, torque = r x F. The magnitude of the torque will not change if the directions of either or both of r and F is reversed.