F = applied force (N, lbf)
a = moment arm (m, ft)
A force of 250 N is acting at the end of a 30 cm long wrench. The torque exerted can be calculated as
T = (250 N) (30 cm) (0.01 cm/m)
= 75 Nm
The calculator below can be used to convert between some common moment or torque units
The Law of Lever is a torque balance on a stationary object and can be expressed as
F1 / F2 = L2 / L1 (2)
F = force (N, lbf)
L = distance from the point (1 or 2) to the force vector (m, ft)
(1) can be transformed to
F1 L1 = F2 L2 (2b)
T1 = T2 (2c)
A person with a mass of 90 kg is standing on one side of a lever 2 m from the balance point. The force on the other side of lever 0.5 m from the balance point can be calculated by modifying (2) to
F2 = F1 L1 / L2
= (90 kg) (9.81 m/s2) (2 m) / (0.5 m)
= 3531 N
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