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Ch. 9-1 Planetary Motion EQ: How does the Earth move on its axis and around the Sun?

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Presentation on theme: "Ch. 9-1 Planetary Motion EQ: How does the Earth move on its axis and around the Sun?"— Presentation transcript:

1 Ch. 9-1 Planetary Motion EQ: How does the Earth move on its axis and around the Sun?

2 Ch. 9-1 Vocabulary 1. Rotation-the spin of a body (planet) on its axis 2. Orbit-the path that a body follows as it travels around another body in space 3. Revolution-one complete trip along an orbit 4. Ellipse-an elongated circle 5. Law of universal gravitation-two objects will always be attracted to one another; the product of the masses of two (or more) objects divided by the square of the distance between the objects.

3 Facts/Information 1. Each planet spins on its on axis. 2. The half that faces the sun is experiencing light/daytime, while the other half is experiencing darkness/nighttime. 3. The amount of time a planet takes to complete a single trip around the sun is called a period of revolution. 4. Earths period of revolution is days. 5. Earths period of rotation is 23 hours and 56 minutes.

4 Facts/Information 6. Keplers First Law of Motion-planets revolve around the sun in an ellipse. 7. Keplers Second Law of Motion-planets move faster when they are close to the sun and slower when they are farther away from the sun. 8. Keplers Third Law of Motion-planets that are more distant from the sun take longer to orbit the sun. 9. If the distance between two objects doubles, the gravitational attraction between them will decrease by a factor of Inertia is an objects resistance in speed or direction until an outside force acts on the object.

5 Poem The Earth moves in an ellipse around the sun and spins on its axis.

6 Chapter 9-1 Quiz 1. Each planet spins on its on __________. 2. Earths period of rotation is __________. 3. Half of the earth that faces the sun is experiencing __________, while the other half is experiencing ___________. 4. Earths period of revolution is ________ days. 5. If the distance between two objects __________, the gravitational attraction between them will __________ by a factor of ______.

7 Quiz continued… 6. The amount of time a planet takes to complete a single trip around the sun. 7. Planets revolve around the sun in an ellipse. 8. An objects resistance in speed or direction until an outside force acts on the object. a. Keplers First Law of Motion b. Inertia c. Period of revolution

8 Quiz continued… 9. Planets move faster when they are close to the sun and slower when they are farther away from the sun. 10. Planets that are more distant from the sun take longer to orbit the sun. a. K eplers Third Law of Motion b. K eplers Second Law of Motion

9 Answer Key 1. Axis hours and 56 minutes 3. Daylight/daytime; night/nighttime days 5. Doubles; decrease; four 6. C. Period of revolution 7. A. Keplers First Law of Motion 8. B. Inertia 9. B. Keplers Second Law of Motion 10. A. Keplers Third Law of Motion

10 Works Cited Allen, Katy Z., et al. North Carolina: Holt, Science, & Technology. New York: Holt, Rinehart, & Winston, 2005.


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