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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

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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?

Friday november 8 2013

Learning Target (LT) # 6Kepler’s Laws of Planetary Motion 11/08/13_____________________________Cornell StyleWrite only underlined text from slides33

Who discovered planet motions

Who discovered planet motions?

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?

Friday november 8 2013

1. Law of Ellipses

2. Law of Equal Areas

3. Law of Periods



  • The degree of elongation of an elliptical orbit.

Friday november 8 2013

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

e = 0e = 1

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

Friday november 8 2013

  • 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:

    Friday november 8 2013

    • Describes the speed of objects at different points.

    • Objects move faster closer to perihelion and slower at aphelion.

    Orbital period

    Orbital Period

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

    Monday november 12 2013

    Monday: November 12, 2013

    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 ____________.

    Friday november 8 2013

    Learning Target (LT) # 6Kepler and Newton 11/12/13_____________________________Cornell StyleWrite only underlined text from slides35

    3 law of periods

    3. Law of Periods

    Friday november 8 2013

    • 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)

    Friday november 8 2013

    p = orbital period

    a = distance from Sol

    a3 = p2

    Orbital periods measured = distance from the Sun.

    Friday november 8 2013

    Example: Jupiter’s orbital period is 11.9 Earth years

    a3= p2






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

    How did newton use this

    How did Newton use this?

    Friday november 8 2013

    • Newton noticed that they also worked for all other objects. WHY?

    • Inertia – tendency of object to resist change in motion unless outside force acts on it.

    Friday november 8 2013

    • 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!

    Friday november 8 2013

    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

    LSOpg 34

    Friday november 8 2013

    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.

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