What types of simple machines are shown in the following pictures?

There are 6 simple machines known as a wheel and axle, pulley, gear, inclined plane, lever, and a screw. A wheel and axle is anything that rolls. A pulley is like a crane. Pulleys help lift heavy objects easily and safely. Gears help the car stay in control and help it to move. Inclined planes are anything just standing on high surfaces. A lever is like a top of a teeter totter such as seesaw. A screw is like a screw you see everyday. It goes though an object to help hold it in place so it won't fall out or get unstable.