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, lbf ft)
F = applied force (N, lbf)
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
F1 / F2 = L2 / L1 (2)
where
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)
or
T1 = T2 (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
F2 = F1 L1 / L2
= (90 kg) (9.81 m/s2) (2 m) / (0.5 m)
= 3531 N
