Torque measures force applied during rotation: **τ = rF**. Torque (τ, the Greek letter tau) = the radius of the lever arm (r) multiplied by the force (F) applied. Radius is measured from the **center of rotation **or fulcrum to the point at which the perpendicular force is being applied. The resulting unit for torque is newton-meter (N-m) or foot-pound (ft-lb).

A = 6 ft., the green box weighs 35 lbs., and the blue box weighs 40 lbs. What does distance B need to be for this lever to balance?

1.75 ft. | |

240 ft. | |

2.63 ft. | |

5.25 ft. |