• #### 1.  When do planets move the fastest?

• Close to the sun
• Far away from the sun

• Mass
• Weight
• Volume
• Temperature
• #### 3.  Consider the model of Kepler's 2nd Law. Each colored wedge represents the same time interval. Kepler states that the area of each wedge must be equal. According to this, what conclusions can you draw about the movement of any planet?

• An orbiting body travels faster as it gets closer to the central massive body.
• An orbiting body covers the same distance for each time interval because the speed changes.
• #### 4.  Consider the law of gravitational attraction. Two spheres with a mass, M, are attracted to each other by a force, F. If the distance between the two spheres doubles while the masses remain constant, will the force between the two spheres change? If yes, how?

• Yes, the forces decreases by 1/16
• Yes, the force decreases by 1/4
• #### 5.  Kepler’s 3rd law states the square of the orbital period is proportional to the cube of the orbital radius. (T2=r3)If a planet's orbital radius is doubled, what happens to the length of a year on that planet?

• It will become twice as long
• It will become about 8 times as long
• It will remain the same

• False

• Circular
• Elliptical

• nutation
• precession
• revolution
• rotation

• perihelion
• aphelion
• #### 10.  What is true about the area between points A, B and the Sun, and the area between points H, I and the Sun?

• The area between A, B and the Sun is the largest.
• The area between H, I and the Sun is the largest
• Both areas are equal in size
• There is not enough information to determine the areas

• gas
• metal
• water
• rock

• longer
• shorter

• aphelion
• perihelion
• foci
• axis

• faster
• slower

• 1st
• 2nd
• 3rd
• 4th
• #### 16.  What are the two factors that influence gravity the most?

• Mass and weight
• Weight and gravity
• Mass and distance
• Weight and distance

• orbit
• ellipse
• barycenter
• precession

• Venus
• Earth
• Jupiter
• Moon
• #### 19.  Weight can best be described as?

• The amount of atoms in an object
• The gravitational force exerted on an object
• The size of an object
• The compactness of an object
• #### 20.  How can the position of the sun in earth's orbit be described?

• The sun is at one of the two focal points of a slightly eccentric ellipse
• The sun is at one of the two focal points of a highly eccentric ellipse

• 4.66x107
• 4.66x10-7
• #### 22.  The areas swept by an invisible line between the sun an the earth will be

• equal if the earth moves for the same amount of time
• smaller if the earth moves for the same amount of time
• #### 23.  Which statement best describes Kepler’s 2nd Law of Planetary Motion?​

• Planets revolve around the sun over equal areas in equal time intervals.
• A planet’s orbital period is proportionate to its distance from the sun.
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