Question

hinge is to door as ______ is to lever. load weight effort fulcrum muscle

Explanation:

A hinge is a part of a door that allows it to swing. A fulcrum is a part of a lever around which it pivots. The relationship is part - whole (specifically, a part that enables a particular motion). Load, weight, effort, and muscle do not have this same part - whole (motion - enabling) relationship with a lever as a hinge has with a door.

Answer:

fulcrum