Wiktionary
n. (context physics English) The distance between the point of application of a force and the axis
Usage examples of "lever arm".
Then he took apart the platform railing and wedged three rejoined sections into the fissure above the fallen man, to form a hoisting lever arm.
We decided to try to crank the spysat in with a traction winch and compensate for the increasing rate of spin with the gyros and thrusters -- shortening the lever arm would speed up the sweeps rotation, but we figured we could handle it.
The farther in the past such an event is, the more powerful may be its influence - because the longer the lever arm of time becomes.
He handed the disk to Fitzgerald, who pushed the reject switch and watched the lever arm lift.
She stopped at a spring-loaded lever arm protruding out from the wall at the edge of the doors just above where they came together.