9.3 Torque
Beam Balance (Torque)

Explanation:
This applet is an illustration of torque and addition of torques as discussed
in Section 9.3. Equilibrium is established when the sum of all torques acting
on the beam is zero (Equation 9.12). Each of the mass pieces has a weight
of 1.0 N, and each of the colored rectangles is 0.10 m. "Left side
torques" result in counterclockwise rotation and are positive; "right
side torques" are negative. 

Source:
Walter
Fendt, Stadtbergen, Germany 
