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Electrical & Gravitational Force

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Newton’s Universal Law of Gravitation Every object in the universe attracts every other object with a force that for two bodies is directly proportional to the mass of each body and that is inversely proportional to the square of the distance between them Gravity becomes weaker with distance A planet 3 times further away from sun than earth would be pulled at 1/9 the force as earth

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Newton’s Universal Law of Gravitation Practice problems Force between Earth & Moon p.49 Force between SUN & Earth Sun mass =1.989 x 10 30 kg Earth mass = 5.98 x 10 24 kg Distance Apart = 1.496 x 10 8 km

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Coulombs Law The electrical force between two charged bodies is directly proportional to the charge on each body and inversely proportional to the square of the distance between them Electrical force grows weaker with distance

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Coulombs Law Practice problems Force between hydrogen proton & electron p.52 Force between generic atoms proton & electron Proton charge = 1.6 x 10 -19 c Electron Charge = 1.6 x 10 -19 c Distance Apart = 13.68 x 10 -16 m

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What is a Coulomb A unit of charge is measured in coulombs 1 electron has a charge of 1.6 x 10-19

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Newton Vs. Coulomb Similar formula’s inverse square laws Gravitaional forces are only attractive Are important when dealing with large masses and distances Electrical forces are attractive & repulsive Are important when dealing with small masses and distances.

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Gravitational and Electrical Fields GravitationalElectrical

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Gravitational Field

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Electrical Field

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