# AST201H1 Midterm: MIDTERM REVIEW B

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###### AST201H1 Full Course Notes

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## Document Summary

Universal law of gravitation: every mass attracts every other mass, attraction is directly proportional to the product of their masses, attraction is inversely proportional to the square of the distance between their centers. Because of momentum conservation, orbiting objects orbit around. Newton and kepler"s 3rd law laws of gravity and motion showed that the relationship between the orbital period and average orbital distance of a system tells us the total mass of the system. When gravity brings object"s together ( 1st law of g), it creates gravitational potential energy. Measure flow of energy in light in watts - 1 watt = 1 joule/s. White light is made up of many diff colours. Opaque objects block/absorb light: reflection/scattering (light can bounce off matter reflection= bouncing in same direction-scattering-bouncing off randomly) Light can act like : wave (pattern that carries energy not matter, particle (thing)- photon- each photon carries a specific amount of radiative energy.