1. A lever is a rigid plank or bar that pivots on a fulcrum. Look at the lever in the picture. Where would you push on the lever to lift the rock?

Levers
Vocabulary: effort, first-class lever, fulcrum, lever, load, mechanical advantage, second-class lever, third-class lever
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Gizmo Warm-up
In the Levers Gizmo™, the strongman tries
to lift animals by pushing down or pulling up
on the lever. The force of his push or pull is
the effort. The weight of the animal is the
load. Both forces are measured in newtons.
 You can move the fulcrum to the left or right by dragging it.
 You can drag animals to any spot on the lever.
 You can move the strongman by dragging him.
 You can change the strongman’s Effort with the slider.

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