Answer:

1. is a wheel that turns around an axle, Usually, there is a groove in the rim of the pulley so that the rope around the pulley will not slip off. A pulley may be fixed, moveable, or a combination of both called block and tackle.

2. a simple wheel and axle is a machine that has a larger wheel connected to a smaller wheel or shaft called axle.

3. is an inclined plane wrapped in a spiral around a cylinder post.