What is force anyway? George Lucas had it right when he coined the famous phrase, "May the force be with you." When battling intergalactic enemies with a light saber, it is definitely best if the force is with you, not against you. The Jedi certainly had their ideas about what "force" is, but what is its correct definition for mere mortals?
It's taught in high school or college physics class that force is an intimidating subject, filled with strange Greek letters, indecipherable formulae and insurmountable complications. In reality, the concept of force is quite simple. What all those complex-looking derivations and diagrams essentially boil down to is that a force is a push or pull acting on a body. Sir Isaac Newton said that every action has an equal and opposite reaction. In force testing, compressing or pulling on a sample will yield an equal and opposite reaction force. This force can be measured.