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Solar SystemFocus Question: How do the planets
stay in orbit?Inv 1-2
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?
Response Questions, cont.
What is the Kuiper Belt, what is found there?
Which planet has the most moons?
How are asteroids and comets alike, different?
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?
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
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
Planets and the Solar SystemVideo 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?
Video Notes – con’t.
What is meant by the rotation and revolution of a planet?
What other planets, beside Earth, might support life?
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.
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.
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
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?
