Torque or Moment of Force  Online Converter
Torque or moment  the tendency of a force to rotate an object.
Torque or moment  the tendency of a force to rotate an object around an axis or a point  is defined as
 the product of the force and the distance from the point or axis to the force vector
Torque can be expressed as
T = F a (1)
where
T = moment  or torque of the force (Nm, lb_{f} ft)
F = applied force (N, lb_{f})
a = moment arm (m, ft)
Example  Torque exerted by a Wrench
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
Moment Converter
The calculator below can be used to convert between some common moment or torque units
Law of Lever
The Law of Lever is a torque balance on a stationary object and can be expressed as
F_{1} / F_{2} = L_{2} / L_{1} (2)
where
F = force (N, lb_{f})
L = distance from the point (1 or 2) to the force vector (m, ft)
(1) can be transformed to
F_{1} L_{1} = F_{2} L_{2} (2b)
or
T_{1} = T_{2} (2c)
Example  Lever
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
F_{2} = F_{1} L_{1} / L_{2 }
= (90 kg) (9.81 m/s^{2}) (2 m) / (0.5 m)
= 3531 N
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