Exit Check 3.1

Planets orbit the Sun in a shape called a(n)

• circle

• ellipse

• focus

• perihelion

Answer explanation

This question links to success criteria: I can use Kepler’s 1st Law to describe the orbit shape of any body around another.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

The path a planet travels around the sun is called its 

• orbit

• ellipse

• barycenter

• precession

Answer explanation

This question links to success criteria: I can use Kepler’s 1st Law to describe the orbit shape of any body around another.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

What has an eccentricity of zero

• a straight line

• a large ellipse

• a circle

• a small ellipse

Answer explanation

This question links to success criteria: I can use Kepler’s 1st Law to describe the orbit shape of any body around another.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

What does Kepler's 1st Law state?

• all planets move in elliptical shaped orbits around the sun

• all ellipses have one foci

• the area that a planet revolves around the sun is equal

• the speed that a planet revolves around the sun changes

Answer explanation

This question links to success criteria: I can use Kepler’s 1st Law to describe the orbit shape of any body around another.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Where is the planet moving faster

• Position A to B

• Position B to C

• Position H to I

• Position I to J

Answer explanation

This question links to success criteria: I can use Kepler’s 2nd Law to predict when an orbiting body travels faster or slower in its own orbit.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Where is the planet moving slowest

• Position A to B

• Position B to C

• Position H to I

• Position I to J

Answer explanation

This question links to success criteria: I can use Kepler’s 2nd Law to predict when an orbiting body travels faster or slower in its own orbit.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

What did Kepler discover about planets and their orbital speed?

• Planets closest to the Sun will orbit with the fastest orbital speed.

• Planets with the greatest mass will orbit the Sun with the fastest orbital speed.

• Planets furthest from the Sun will orbit with the fastest orbital speed.

• Planets with the least mass will orbit the Sun with the fastest orbital speed.

Answer explanation

This question links to success criteria: I can use Kepler’s 3rd Law to relate an object’s orbital radius to its orbital period.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

According to Kepler's second law, in the picture which of the following is true for all of the purple sectors shown in the diagram

• They are all show areas where the object is accelerating while the white sections show areas of constant velocity.

• They all have the same area to show that they cover the same amount of displacement

• They all have the same area to show that they take the same amount of time

• They all go slow, as shown by the use of a darker color

Answer explanation

This question links to success criteria: I can use Kepler’s 2nd Law to predict when an orbiting body travels faster or slower in its own orbit.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

While working as an intern for an astrophysics research telescope, you identify three exoplanets in another solar system orbiting their star. Planet A has an the largest orbital radius, Planet B has the smallest orbital radius, and Planet C has a medium orbital radius.  What should you conclude about their orbital periods??

• Planet C takes the longest to complete one orbit. Planet B takes the least time to complete one orbit.

• Planet A takes the longest to complete one orbit. Planet C takes the least time to complete one orbit.

• Planet B takes the longest to complete one orbit. Planet C takes the least time to complete one orbit.

• Planet A takes the longest to complete one orbit. Planet B takes the least time to complete one orbit.

Answer explanation

This question links to success criteria: I can use Kepler’s 3rd Law to relate an object’s orbital radius to its orbital period.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

If a moon’s orbital radius doubles, by what factor does its orbital period change?

• The period increases by a factor of 2.82

• The period decreases by a factor of 2.82

• The period increases by a factor of 5.20

• The period increases by a factor of 8.28

Answer explanation

This question links to success criteria: I can use Kepler’s 3rd Law to relate an object’s orbital radius to its orbital period.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.