1. Label it as completely as possible.
Do Now
Using about ½ a page, draw a diagram of earth in its elliptical orbit around the sun.
Label it as completely as possible.

2. What are the effects of earth’s elliptical orbit?
By the end of this lesson you should be able to:
Describe how potential and kinetic energy affect movements of satellites in orbit.
Explain how gravitational force between objects can change
Explain why orbital speed changes as a satellite changes position in its orbit.

5. Kepler’s Second Law
Satellites sweep across equal areas in equal amounts of time.

6. Why?
Objects stay in orbit because of a balance between inertia and gravity.
Gravity is determined by the mass of the objects and the distance between them.
When a satellite gets closer to the object it orbits, it speeds up.

7. Draw this!
NOT TO SCALE
VERY EXAGGERATED!

8. Kepler’s Third Law
There is a direct relationship between a planet’s distance from the sun and the time it takes to orbit.
1 AU (astronomical unit) = the distance from earth to the sun