NATS 1585 Lecture Notes - Lecture 6: Big Bang, Electric Field, Mass Number
5 Mar 2016
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Mass = quantity of matter (no way to make mass zero) Weight = force acting on mass (can be zero if there is no gravity around) Newton"s three laws of motion: objects move at constant velocity if no force is acting, force = mass x acceleration, for every force there is an equal and opposite reaction force (action reaction) Why do objects move at constant velocity if no force acts on them. Objects continue at constant velocity because of conservation of momentum. The total momentum of interacting objects cannot change unless an external force is acting on them. Interacting objects exchange momentum through equal and opposite forces. Angular momentum = mass x velocity x radius. The angular momentum of an object cannot change unless an external twisting force is acting on it aka torque. Earth experiences no twisting force as it orbits the sun. Angular momentum conservation also explains why objects rotate faster as they shrink in radius.
