Homemade Simple Machines for Kids. A simple machine is a tool most often used by a person to make a job easier or more efficient. A machine with one working part is classified as simple, whereas a tool with multiple parts working together or in sequence is considered a compound machine. Children can make many simple machines for fun or to demonstrate the different uses of simple machines. The six types of simple machines are pulleys, levers, screws, inclined planes, wheels and axles and edges.