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Torque and Tangential Force
Torque is a combination of force and distance that may be defined as twisting effort. This quantity is used in the analysis of rotating devices. In Fig. 15 a tangential force of F newtons applied to the free end of the crank having an arm of r m produces a torque of
The amount of energy put into the crank in rotating it through an infinitesimal angle of dθ radians is, from Eq. 11
The power associated with torque is
Where ω is the angular velocity in radians per sec. Hence, if n is the speed in rpm, the angular velocity is expressed by


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