A lever in science is a simple machine : a rigid bar or beam that pivots around a fixed point called the fulcrum. It helps you move, lift, or pry things by changing the size or direction of the force you apply.

Main parts

  • Fulcrum : the pivot point.
  • Effort : the force you apply.
  • Load : the object being moved.

How it works

A lever can make a small force lift a heavier load by increasing the turning effect around the fulcrum, which is why tools like scissors, bottle openers, and wheelbarrows are so useful.

Simple example

If you push down on one end of a seesaw, the other end goes up because the board rotates around the fulcrum in the middle.

If you want, I can also explain the three classes of levers with easy examples.