Kepler s laws
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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 Laws

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Kepler s laws

Kepler’s Laws


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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