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Torque is the ability of a force to cause a body to rotate
a particular axis.
In Figure 8.1, a force, F acts on an object at the point B . The object is pivoted so that it rotates about the point, O . The magnitude of the torque caused by F about the axis through O is:
= Flwhere l (known as the moment arm of the force) is the perpendicular distance from the line of force to the axis through O :
l = lsinwhere is the angle between the line of force and the line OB .
|= Fl = Flsin = Fl||(1)|
|= + +...||(2)|