pivot, fulcrum、支点

PIVOT AND FULCRUM, TORQUE'N IT UP!

"The pivot point and fulcrum are basically synonymous... The fulcrum is more of a point against which lever is placed or on which it turns or is supported. The pivot, on the other hand, is an object (short shaft or pin) on which something turns or oscillates."

Lever, Wikipedia

A lever (/ˈliːvər/ or US: /ˈlɛvər/) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. 

A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. 

(Pearson Scott Foresman, Public domain, via Wikimedia Commons)

The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot.

As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot. Therefore, a force applied to a point farther from the pivot must be less than the force located at a point closer in, because power is the product of force and velocity.^[7]