From site: Physics begins with the everyday physical world around usthe blue of the sky, the colors of the rainbow, the fall of an apple, the motions of the moon. Whats happening here? Why do things work this way?
Physics goes on to give us many answersalong with a rich and detailed account of things like force, motion, gravity, heat, light, electricity and magnetism: the mechanisms that actually give rise to the everyday world.
But of course, physics doesnt end there. Once you start asking about the fall of an apple, theres no turning back. Each question leads to the next, until you finally find yourself probing into the deepest secrets of matter, energy, spaceeven time itself. What are they? How do they really work? And where is the deep, unifying principle that can help us truly understand them?