Lever
The amount of force produced by a machine can not be greater than the amount of force put into it.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Simple Machines. February 13, 2013."
http://cnx.org/content/m42174/latest/
OpenStax CNX
CC BY 3.0.