When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Science kits are a great way to get kids curious about our world and beyond. After all, these kits have ...