Phys Notes March18

# Phys Notes March18 - Y17 ch12 gravity 1 Ch 12 GRA VITY Key...

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Y17 ch12 gravity 1 Ch 12 GRAVITY Key Concepts The gravitational attraction between two point par- ticles is proportional to the product of their masses and inversely proportional to the square of the distance r between them. f1 F g = G m 1 m 2 r 2 ,G = 6 . 7 × 10 11 N · m 2 kg 2 – Newton’s Law of universal gravitation (1687). Weight of a body is the total gravitational force acting on it. Gravitational potential energy is inversely propor- tional to the distance between two particles: U ( r )= G m 1 m 2 r Outside any spherically symmetric body the gravi- f2 tational force exerted by that body is the same as though all its mass were concentrated at its center.

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Y17 ch12 gravity 2 ¨ Compute the ratio of magnitudes of sun’s gravita- tional force to earth’s gravitational force for an object on the earth’s surface. R E =6 . 37 × 10 6 m distance Sun - Earth = 150 × 10 6 km ¨ (Example 12.10) ‘‘ Journey to the center of the earth ’’ F ( r )=?
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## Phys Notes March18 - Y17 ch12 gravity 1 Ch 12 GRA VITY Key...

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