Three Fundamental Physics Rules of Life

Your entire life is governed by three simple physics rules. First, inertia.

An object at rest stays at rest. That's why you need a force to get you off the couch.

An object in motion stays in motion, which is why you lurch forward when a car suddenly brakes.

Second, force equals mass times acceleration. To make something go faster,

you need more force. It's also why it’s harder to push a heavy box than a light one.

Third, for every action, there's an equal and opposite reaction. When you jump,

you push the Earth down, and the Earth pushes you up.