Thomson Learning, 1993. Simple Machines . Rockwell, Anne and Harlow Rockwell. Machines and How They Work . Thomas Y. Crowell, 1983.
Procedure Tell the children that in addition to tools, people also use machines to get a job done.
The machines we are going to learn about today are small and are called simple machines. When using a simple machine you have to put forth effort and energy to get work done, but the machine makes the task easier. Make sure that the children understand the difference between the two types of machines - simple and complex. Tell them that complex machines are made up of different kinds of simple machines. Remind them that both types of machines help you to complete a task more easily and allow you to do things you might otherwise not be able to do.