a screw
Lever.
There are four simple machines used to make the compound machine known as the lawn mower. These simple machines are the wheel and axle, the screw, the lever, and the wedge.
A lever.
wheel and axle
pulley and rope
lever and pulley
A compound machine.
Rims and tires
wheel and axle
At least 300
a lever and a well with a bucket.