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Kepler’s Laws. Kepler’s Laws. Johannes Kepler Mars’ orbit is not a perfect circle, it is elliptical The speed of Mars’ orbit changes Closer to sun = faster Farther away from sun = slower Lead to Kepler’s 3 Laws. Kepler’s 1 st Law.

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kepler s laws1
Kepler’s Laws
  • Johannes Kepler
  • Mars’ orbit is not a perfect circle, it is elliptical
  • The speed of Mars’ orbit changes
  • Closer to sun = faster
  • Farther away from sun = slower
  • Lead to Kepler’s 3 Laws
kepler s 1 st law
Kepler’s 1st Law
  • The path of each planet around the sun is an ellipse with the sun at one focus
kepler s 2 nd law
Kepler’s 2nd Law
  • Each planet revolves so that the “imaginary line” that connects it to the sun sweeps equal amount of area in equal time intervals
  • Closer to sun = faster
  • Farther away = slower
kepler s 3 rd law
Kepler’s 3rd Law
  • The square of a planet’s orbital period is proportional to the cube of its distance from the sun
  • Orbital period - how long it takes to orbit the sun
  • Astronomical Unit (AU) – average distance between Earth and sun – 150 million km
  • T2 = d3 ; T = orbital period, d=distance from sun in AUs
kepler s 3 rd law1
Kepler’s 3rd Law
  • T2 = d3
  • Mars has period (T) of 1.88 years (T = 1.88)
  • (1.88)2 = 3.54
  • d3 = 3.54
  • d = 1.52 AU
kepler s laws tri fold
Kepler’s Laws Tri-fold
  • Use a tri-fold/brochure to explain Kepler’s 3 Laws. There should be no words other than labeling each 3rd as to which law you are demonstrating. You may also use the formula for Kepler’s 3rd law.
orbits
Orbits
  • Barycenter – point between two objects where they balance each other
  • When a moon orbits planet, or planet orbits a star, both bodies are orbiting around a point that lies outside of the larger body (star/planet)

http://www.youtube.com/watch?v=rKo6tfFtZg8

(2:59)

http://www.youtube.com/watch?v=KnHUAc20WEU

http://en.wikipedia.org/wiki/Barycentric_coordinates_(astronomy)

orbits1
Orbits
  • The Sun is NOT a stationary object.
  • Sun moves as the planets tug on it
  • Sun orbits the solar system’s barycenter
moon and earth relationship
Moon and Earth Relationship
  • Earth pulls on the moon, and moon pulls on Earth
  • This “tugging” from the moon can cause the Earth to bulge
moon and earth relationship1
Moon and Earth Relationship
  • Earth’s solids cannot give, however water does, causing our tides
  • Two high tides and two low tides a day
  • 12hrs and 25 min between two high tides
moon and earth relationship2
Moon and Earth Relationship
  • Rise and fall daily due to Earth, Sun, and Moon interactions
  • Since earth is rotating, we experience two tides each day
moon and earth relationship3
Moon and Earth Relationship
  • Spring Tides – when moon and sun interact together and form extreme tides.
    • Occurs during full and new moons
moon and earth relationship4
Moon and Earth Relationship
  • Neap Tides – moon and sun pull at right angles and cancel each other out...very weak tides

http://www.youtube.com/watch?v=l37ofe9haMU

http://www.youtube.com/watch?v=rRPtNAA-9UE

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