Simple machines
Inclined plane:
Simple
Flat
Low effort
Wheel and axle
Push and pull heavy loads
More than 5,000 years old
Wedge
First
Oldest
Splitting or separating
Screw
Moves vertically
Pushes
Keeps things together
Pulley
Lifts objects up
composed of a wheel and a rope
Lever
Lift heavy loads
Open lids
Launches projectiles