5 Physics Equations Everyone Should Know

Just like every curve in space has a length, every conceivable particle trajectory between (x1, t1) and (x2, t2) has (as we’ll see) a quantity called the action, which depends on how the kinetic and potential energy evolve along the path.

There is no better way to answer the question “what is energy?” than by referring to one of the most insightful physicists of the 20th century—to the protean mind of Richard Feynman, who (in his famous Lectures on Physics) tackled the challenge in his straightforward manner, stressing that “energy has a large number of different forms, and there is

This is what physicist Max Planck (the father of quantum mechanics), Einstein, and others observed: No matter how much you know, there is an infinite amount of chance and randomness in the universe.