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Solar System Gravity
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Solar System Gravity


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  • 1. Solar System Focus Question: How do the planets stay in orbit? Inv 1-2
  • 2. A Tour of the Solar System Response Questions  What is the Sun, what is it made of?  What is the solar system?  What planets are terrestrial planets? Gas Giants?
  • 3. Response Questions, cont.  What is the Kuiper Belt, what is found there?  Which  How planet has the most moons? are asteroids and comets alike, different?
  • 4. Orbit  Sir Isaac Newton – Studied moving objects – Three Laws of Motion  Newton’s first law of motion – Moving objects travel at a constant speed in a straight line. – A moving object can change speed and/or direction only when a force pushes or pulls it.  How can planets orbit the Sun if objects only move in straight lines?
  • 5. Orbit Demonstration  Ball - String – What made the planet travel in a circle? – Newton’s law says objects travel in straight lines unless acted on by a force  Planets are moving objects – Move in circular orbits around the Sun – Must be a force pulling on planet that changes its direction constantly  Gravity – Sun’s gravity is pulling on the planets – Gravitational attraction between Sun and planets keeps planets moving in circular orbits
  • 6. Why Doesn’t Earth Fly Off Into Space?  Why do planets stay in orbit around the Sun?  How is a ball on a string like a planet in its orbit?  What keeps the Moon in its orbit around Earth?  Homework – Read Ramon E. Lopez, pg 159 and Mae Jemison: Astronaut, page 162-3
  • 7. Planets and the Solar System Video Notes  Why is the system of sun and planets called the solar system?  Which planets are inner planets?  Which planets are outer planets?  How are the inner and outer planets different?  Which planet is closest to the Sun? Why isn’t it the hottest planet?
  • 8. Video Notes – con’t.  What is meant by the rotation and revolution of a planet?  What other planets, beside Earth, might support life?
  • 9. Vocabulary  Gravity – The force of attraction between two objects; larger bodies, like the Sun, have a greater force of gravity.  Inertia – Moving objects stay in motion, in a straight line, unless something acts upon them  Revolve – To travel in a path or orbit around another object; for example, Earth revolves around the Sun.
  • 10. Vocabulary  Revolution – Occurs when an object travels in an orbit and returns to its starting position. It takes Earth one year to make a complete revolution around the Sun.  Rotate – To spin or turn around on an axis or center point. Earth makes one complete rotation every 24 hours.
  • 11. Content  What is gravity? – Gravity if force of attraction between two objects. – Larger objects, like the Sun, have a greater force of gravity  Why do planets travel around the Sun in circular paths? – Gravity pulls on planets with a force that changes their direction of travel from a straight line into a circle Your questions?  Homework – read Summary: Solar System pg 164-167 + Questions 
  • 12. Summary: Solar System  What are the main objects in the solar system? How are they alike or different?  What is the Sun? What is it made of? What is its role in the solar system?  Why do the planets and other objects in the solar system stay in their orbits?