Just as we define which direction
is positive and negative for x and y directions, we must define which direction of
rotation is positive or negative for torques. These symbols ( ,  ) defines whether clockwise or counter-clockwise is positive.When writing torque equations, you must choose the center of rotation
first. It can be chosen anywhere you want; however, you will find that in solving
equilibrium problems, wisely chosen centers of rotation can make getting the answer more
simple.
Use the below table by referring to the
diagram above. |
F = 0
= 0
F
