Simple machines for a complex mind
1st period physical science
6 Simple machines
The other three.
Next is the pulley, a pulley is a simple machine that uses grooved wheels and a rope to raise, lower or move a load. Then a wheel with a rod, called an axle, through its center lifts or moves loads. Lastly, a screw is an inclined plane wrapped around a pole which holds things together or lifts materials.