Other Mechanical Forces

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SAT Subject Test in Physics › Other Mechanical Forces

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A wrench is being used to tighten a bolt. The center of the bolt is the pivot point, and the wrench is long. If a force of is applied at the midpoint of the wrench and that force is parallel to the wrench, what is the torque?

$0N\cdot m$

$5N\cdot m$

$10N\cdot m$

$20N\cdot m$

$7.07N\cdot m$

Explanation

The equation for torque is

$\tau=r\perp F$

The force is applied meters from the pivot. and in this case because the force is parallel, the perpendicular component of force is zero, so:

$\tau= (.5)(0)$

$\tau=0N\cdot m$

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