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Friday: November 8, 2013. Science In The News. Daily Science Question pg 17. Describe the shape of a planetary orbit? What does it look like? Where is the Asteroid Belt located? By what planet?.

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Friday november 8 2013
Friday: November 8, 2013

Science In The News

Daily science question pg 17
Daily Science Question pg 17

  • Describe the shape of a planetary orbit? What does it look like?

  • Where is the Asteroid Belt located? By what planet?

Learning Target (LT) # 6Kepler’s Laws of Planetary Motion 11/08/13_____________________________Cornell StyleWrite only underlined text from slides 33

Johannes kepler
Johannes Kepler

  • Found patterns in planet movement; developed 3 laws of planetary motion.

What are kepler s laws
What are Kepler’s Laws?

1. Law of Ellipses

2. Law of Equal Areas

3. Law of Periods


  • The degree of elongation of an elliptical orbit.

1. Law of Ellipses: all orbits are elliptical, from nearly circular to parabolic.

e = 0 e = 1

“e” is the eccentricity (how stretched to a max of “1”)

  • Kepler’s second law states that equal areas are covered in equal amounts of time as an object orbits the sun.

  • Both shaded triangles have the same area (think carpet).

  • 2. Law of Equal Areas:

    Orbital period
    Orbital Period

    • The time required for a body to complete a single orbit.

    Daily science question pg 171
    Daily Science Question pg 17

    • Kepler’s first law states that each planet orbits the sun, not in a circle, but in an ellipse. TRUE or FALSE

    • Kepler’s law that describes how fast planets travel at different points in their orbits is called the law of ____________.

    Learning Target (LT) # 6Kepler and Newton 11/12/13_____________________________Cornell StyleWrite only underlined text from slides 35

    3 law of periods
    3. Law of Periods

    • Law of Periods:

    • Relates the planets average distance from Sol to the time it takes the planet to complete 1 complete orbit.

    • Measured in Earth years in distance of AU’s.

      K x a3 = p2(K =1)

    p = orbital period

    a = distance from Sol

    a3 = p2

    Orbital periods measured = distance from the Sun.

    Example: Jupiter’s orbital period is 11.9 Earth years

    a3= p2






    Jupiter’s average distance from Sol is 5.2 AU’s.

    • But what force is causing the curve of the elliptical orbits, of a thrown ball, of a launched arrow…the apple falling from a tree?

    • Objects in motion will stay in motion, unless…

      Newton’s answer: Gravity!

    Gravity is effected by distance and mass .

    The closer the planet is to the sun, the stronger the gravity AND the faster the planet moves in its orbit,

    Lso pg 34
    LSO pg 34

    In Review:

    • Kepler’s 1st law states planets orbit the sun in curved paths called ellipses

    • Kepler’s 2nd law states planets closer to the sun travel faster than those further away.

    • Kepler’s 3rd law relates a planet’s average distance from around the sun to the time it takes to make one orbit.