Planetary Motion and Physical Laws Review

An Earth-centered view of the universe

• Galactic
• Geocentric
• Astronomic
• Heliocentric

 This diagram shows a ____________ system, first proposed by Copernicus and later supported by Galileo and Kepler.

• Heliocentric
• Ptolemaic
• Geocentric
• Polycentric

This model best illustrates which of the following laws?

• Kepler's 2nd Law of Motion
• Newton's 1st Law of Motion
• Kepler's 3rd Law of Motion
• Newton's Law of Universal Gravitation

Planets revolve around the sun in an elliptical orbit. Is this Kepler's 1st, 2nd, or 3rd Law? ?  

• 1st
• 2nd
• 3rd
• None

Which law explains why the blue planet takes longer to move around the sun than the red planet?

• Kepler's 2nd Law of Motion
• Newton's 2nd Law of Motion
• Kepler's 3rd Law of Motion
• Newtons Law of Universal Gravitation

Which planet would have the greatest velocity?

• Mercury
• Mars
• Jupiter
• Neptune

Which planet would have the longest year?

• Mercury
• Mars
• Jupiter
• Neptune

Which of Kepler's Laws states that when a planet is farther away from the sun it travels at a slower rate of speed than when it is closer to the sun?

• 1st
• 2nd
• 3rd
• None

This model best illustrates which of the following laws?

• Kepler's 2nd Law of Motion
• Newton's 1st Law of Motion
• Kepler's 3rd Law of Motion
• Newton's Law of Universal Gravitation

How does changing the distance between objects affect the force of gravity?

• Decreasing distance increases gravity
• Increasing distance increases gravity 
• Mr. Silvio knows, but he's not telling
• Distance does not affect gravity