this book was read on Reading Eggs
A wheel with a rod is called an Axle.
Many machines that we use every day are Compound Machines.
A Pulley uses a wheel and a rope to raise or lower a load. It increases a force or changes its direction.
Leavers lift or move loads. They are one of the most common Simple Machines.
An inclined plane is a flat surface with one end higher than the other.