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Gravitation – Fundamental Force

Gravitation – Fundamental Force F= (Gm 1 m 2 )/R 2  10 -7 N for m=100Kg (220lbs) and R= 1 meter *Calculated force smaller than weight of flea* Ocean Tides – associated with gravitational pull of moon; why not sun?

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Gravitation – Fundamental Force

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  1. Gravitation – Fundamental Force F= (Gm1m2)/R2 10-7 N for m=100Kg (220lbs) and R= 1 meter *Calculated force smaller than weight of flea* Ocean Tides – associated with gravitational pull of moon; why not sun? Two High Tides – due to differences in gravitational pulls on opposite sides of earth.

  2. Perturbations – slight departures from smooth elliptical orbits (effects due to other bodies) – led to discovery of Neptune and Pluto • Perturbation calculation of Uranus orbit – 1840s by Urbain Leverrier & John Admas spurred Johann Galle to find Neptune. • Discovery of Neptune did not fully explain orbit of Uranus – More calculations by Percival Lowell led Clyde Tombauch (1930) to find Pluto • 10th planet? Difficult to find, since we see them via reflected light

  3. Haley’s Comet (T = 76 yrs) – Newton’s inverse square law – elliptic orbit. • Gravitational Field – visualize: heavy object denting a stretch rubber sheet. • Black Hole – object sinks enormous depth into sheet • Detection – radiation produced (x-rays) from accelerated matter. • Planetary Fly By Weightlessness G’s of force – plane in loop – the loop Microgravity Orbital Decay

  4. Acceleration of Earth • Drop board eraser mass = 100g = .1K Mearth = 5.98 x 1024 Re= 6.38 x 106 m G = 6.67 x 10-11 Nm2/kg2 Me Ae= (GMbMe) / Re Ae= 1.64 x 10-25 m/s2 Mb Ab= (GMbMe) / Re Ab = ?

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