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Mechanics
Mechanics is the oldest branch of physics, and is concerned with the motion of bodies (like cars, trains, tennis balls and planets).It details how objects move in our universe, and asks why it is that they move at all.
Newton's Laws of motion
(coming soon)
What is energy?
It's one of the most mysterious things in the universe, yet we live with it every day.
Lagrangian mechanics
(coming soon)