Q. What is mechanical advantage?

The Merriam Webster dictionary definition of "mechanical advantage" is "the advantage gained by the use of a mechanism in transmitting force; specifically :  the ratio of the force that performs the useful work of a machine to the force that is applied to the machine."  Ultimately you are aiming for minimum effort exerted for maximum output.  This is why simple machines were invented.

To learn more about mechanical advantage and simple machines check out the Links provided.

You can also find information in the following databases accessed through the VLC "Games and Databases" tab:

• BrainPop - go to Science - Motions, Forces & Time
• PowerKnowledge Physical Science - Force and Motion
• Britannica Middle School Edition - search under Mechanics

These should get you started.  If you have anymore questions feel free to contact me.