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| Friction torque ： ウィキペディア英語版 |
Friction torque
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 choose to take to eliminate these disruptions. Ball bearings are an example of an attempt to minimize the friction torque.
Friction torque can also be an assist in engineering. Bolts and nuts, or screws are often designed to be fastened with a given amount of torque, where the friction is adequate during use or operation for the bolt, nut or screw to remain safely fastened. This is true with such applications as lug nuts retaining wheels to vehicles, or equipment subjected to vibration with sufficiently well attached bolts, nuts or screws to prevent the vibration from shaking them loose.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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