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Unit 5: The Solar System

Unit 5: The Solar System. Lesson 3: What holds the moon and planets in place?. Vocabulary #1. Orbit: The path that one body takes in space as it revolves around another body. Vocabulary #2. Elliptical: Oval shaped. Vocabulary #3. Inertia: The property of matter that keeps

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Unit 5: The Solar System

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  1. Unit 5: The Solar System Lesson 3: What holds the moon and planets in place?

  2. Vocabulary #1 • Orbit: • The path that one body takes in space as it revolves around another body

  3. Vocabulary #2 • Elliptical: • Oval shaped

  4. Vocabulary #3 • Inertia: • The property of matter that keeps an object at rest or moving in a straight line

  5. Vocabulary #4 • Gravity: • The attraction that pulls objects toward Earth.

  6. The Path of a Planet Around the Sun • The Earth revolves around the Sun in an elliptical orbit. • The moon revolves around the Earth in an elliptical orbit.

  7. 2 Properties that hold the Moon and Planets in Orbit • Inertia: • Keeps objects moving in a straight line unless it is pushed or pulled by some force.

  8. Gravity: the attraction that pulls objects toward Earth.

  9. FACTS ABOUT THE MOON • Both Earth & the moon rotate as they revolve. • The same side of the moon always facesEarth. • The side we can’t see is called the far side of the moon. • The moon only reflects light from the Sun.

  10. PHASES OF THE MOON

  11. Gravity in Space • When inertia and gravity are balanced (as they would be in space), we see things as “floating”. • The shuttle is actually “falling” around Earth at a constant speed which causes a weightless environment.

  12. Online Resources http://www.youtube.com/watch?v=h0hmnX91SD0 phases of the moon rap (3:43) http://www.youtube.com/watch?v=dOy5T6hRhpk&feature=related phases of the moon (3:42) http://www.youtube.com/watch?v=exIpL0Uhr_k&feature=related moon rotation (1:00) http://www.youtube.com/watch?v=XHL1opjFR7Y astronauts weightless in space (2:34)

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