machines

Most people would look at you funny if you told them a cork screw, a ramp, and a crow bar are machines. Machines are sposed to be like table saws, cordless screw drivers, and printing presses. Cork screws and ramps are also machines. They are in a class of machines called simple machines. A machine is any thing that redirecs fource. A loading ramp for example. If you push an object forward on a ramp the ramp will make the object go up.
A complex machine is a machine that uses more than one simple machine like a bicycle. A bike has simple machines like the chain and sproket being a pully system and the peddles are a type of lever.