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Lecture 8

Lecture 8

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PHYS 183
Tracy Webb

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PHYS 183 – The Milky Way Inside and Out – Tracy Webb Winter 2013 Lecture 8: January 23 , 2013  conservation of momentum o momentum = mass x velocity o total momentum of an object cannot change unless a net force acts upon them o interacting objects exchange momentum through equal and opposite forces o momentum is transferred, not speed o two pool balls, one has m = 0, other has m = m x v; after the collision other has m = m x v and original has m = 0  conservation of angular momentum o angular momentum = mass x velocity x radius (distance to the sun) o angular momentum of an object cannot change unless an external twisting force acts on it (torque) o earth experiences no twisting forces as it moves around the sun  rotation & orbit will continue indefinitely o earth changes velocity (speed) depending on how close it is to the sun o explains why objects rotate faster as they shrink in radius  when you spin in figure skating you spin faster if your arms are pulled in  conservation of energy o kinetic energy  motion  earth has kinetic energy in its orbit around the sun o radiative energy  light  energy we see coming from lamps, computers, sun o potential energy  stored energy  gas, food  energy that will be converted into another form of energy o energy can change type but cannot be destroyed o thermal energy  collective kinetic energy of many particles (in a rock, air or water)  particles move more in higher temperatures and less in lower temperatures  related to temperature, but not the same  depends on both temperature & density  ai
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