AST201H1 Lecture Notes - Lecture 4: Strong Interaction, Strong Gravity, Electromagnetism
18 Dec 2015
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AST201H1 Full Course Notes
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People could only travel into the future through riding a spaceship at a speed near the speed of the light and then come back to earth finding everyone else has aged more than him. The four galaxies appearing yellow are bound together by gravity and much older than the whiter one. A unified force: strong nuclear force + electromagnetism + weak nuclear force another: strong and weak nuclear forces only influence things insides an atom. Every particle feels the electromagnetic force including tension, friction. Gravity: its range is infinite => everything in the universe that has a mass produces and feels gravity: but it"s a weak force st law. Objects move with constant speed and direction unless acted on by an. If one body exerts a force on another, the other body will exert a force of equal strength but opposite direction. Note: equal opposite forces are exerted but each objects" acceleration is different due to difference in mass.
