A lever is a simple machine that people use to gain a mechanical advantage, such as making work easier. A lever arm is a stick or beam to pivot at a point. A fulcrum is the point where the lever arm pivots. Load is the mass lifted or the resistance overcome by a lever. Effort is the force needed to move a load or overcome a resistence.
Effort is measured in newtons .
Two-coordinate graphs show relationships between two variables. Science Word Bank for More Leverage 1. Class-1 levers have the fulcrum in the middle and the load and effort at the ends. Class-2 levers have the load in the middle and the fulcrum and effort at the ends. Class-3 levers have the effort in the middle and the fulcrum and load at the ends.