LEVER
What is a lever?
a bar or handle that moves around a fixed point,
so that one end of it can be
pushed
pulled
in order to control the operation of a machine or move a heavy or stiff object.
Parts of a lever:
4 very important parts
- The bar or the beam.
- The fulcrum.
- Effort or force.
- Load.
The Three Lever Classes
Class one lever:
the Fulcrum is between the Effort and the Load.
The mechanical advantage is more if the Load is closer to the fulcrum.
Examples of Class One Levers include seesaws, boat oars and crowbar.
Class two lever:
the Load is between the Effort and the Fulcrum.
The mechanical advantage is more if the load is closer to the fulcrum.
Examples of Class Two Levers include wheelbarrows.
The tree lever:
the Effort is between the Load and the Fulcrum.
The mechanical advantage is more if the effort is closer to the load
An example of Class Three Lever is a garden shovel.
