The mechanical structure controls the movements and makes up most of the body of the machine. In the case of simple machines they were first powered by humans. The power source provides the energy to get the device moving. Machines work by having a power source and a mechanical structure. You might not be able to lift your friend off the ground on your own, but if you are each sitting on different sides of a seesaw, you can probably move so that your friend is lifted into the air. (Renaissance scientists defined six types of simple machines: a lever, a wedge, a pulley, a screw, a wheel and axle, and an inclined plane.) Think of a seesaw on the playground. Simple machines, such as levers, allow us to apply force to accomplish a task we might otherwise not be able to complete. Machines are mechanical devices we use to complete specific tasks. Can you figure out how it enlarges, shrinks or turns drawings upside down? In this activity you will make your own pantograph and then duplicate your drawings. It makes copies that can be scaled up or down or made the same size. A machine called a pantograph, however, could help. Have you ever wished you could copy a drawing but make it larger or smaller? If you’ve ever tried to create a larger or smaller copy of your work, you’ve probably realized that it is very hard to get the details right.
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