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# Friday: November 8, 2013 - PowerPoint PPT Presentation

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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Science In The News

• 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

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

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:

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

• 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

• 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)

a = distance from Sol

a3 = p2

Orbital periods measured = distance from the Sun.

a3= p2

p=11.9

p2=142

p2=a3

a3=142

a=5.2

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…