Sept 3, 2015 Planetary Motion II 20.4 pgs 630-633
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| What is Kepler’s 1st Law? | All planets travel around the sun in an elliptical orbit. |
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| What is Kepler’s 2nd Law? | A Planet move through the orbit faster when it is closer to the sun. |
| | When it is further away it moves slower. |
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At point A, a planet moves faster. At point B the planet will move slower. |
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| What is Kepler’s 3rd Law? | Planets farther away from the sun, take longer to orbit the sun. |
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| How does gravity and inertia | Gravity is a force that pulls. Inertia keeps objects moving in a straight line. |
| Work together? | These forces work together to form the orbit. Without inertia, all objects |
| | Will crash into the sun. Without gravity, all objects will go out into the |
| | universe. |
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| What is the retrograde rotation | Mars appears to move backwards when it moves around the sun. |
| Of Mars and the outer planets | Because Earth is closer to the sun in its orbit. I appear that Mars is |
| From Earth’s perspective? | Making a looping motion. |
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Summary (Write summary in three or four sentences at the end of all notes pages on the topic)
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