Simple machines are types of machines that do work with one movement.
Compound machines are two or more simple machines working together. A wheelbarrow is an example of a complex machine that uses a lever and a wheel and axle. Machines of all types make work easier by changing the size or direction of an applied force. The Elements of Machines website is related to the various types of machines. Remember to use the back button of your browser to return to Sci-ber Text.