This image displays an example situation where there is an active frictional torque. The large black
vector arrow represents the primary
force acting on the
bar (the thick black
line), causing it to rotate around the gray
dot at its opposite end which represents an
axle. The large red vector arrow represents the
torque caused by the primary force. The small black vector arrow represents the
frictional force caused by the bar sliding across the second bar (grey).
Friction torque is the
torque caused by the
frictional force that occurs when two objects in contact move. Like all torques, it is a rotational force which may be measured
newton metres or pounds-feet.
Engineering
Friction torque can be disruptive in
engineering. There are a variety of measures
engineers may chose to take to eliminate these disruptions.
Ball bearings are an example of an attempt to minimize the friction torque.
Examples
★ When a
cyclist applies the brake to his/her forward
wheel, the
bike tips forwards due to the frictional torque between the wheel and the
ground.
★ When a
golf ball hits the ground it begins to spin in part because of the friction torque applied to the golf ball from the friction between the golf ball and the ground.
See also
★
Torque
★
Force
★
Engineering
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