1. You will have just over 30 seconds to answer each clicker question.

2. Activity 11, #2: Which ellipse has the greatest eccentricity
Activity 11, #2: Which ellipse has the greatest eccentricity? Which has an eccentricity of zero? Which ellipse is most like Earth’s orbit?
A D B
A D D
C D B
C D D
D C B
D C D

3. Activity 11, #3: Which orbits in Figure 3 are impossible?
None of them A B C D
A and C
A and D
A, C and D
C and D
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4. Activity 11, #5: Rate the positions in order of the speed of the planet at each position, from highest speed to lowest.
B A E G=D F C
C F G=D E A B
E A=D=G F B=C
B=C F A=D=G E
All have the same speed.

5. Now answer questions 1-4 on the screen; you’ll enter your answers using clickers later.

6. 1. Orbital Period and Distance activity: Which of the two planets will complete and orbit around the central star in the least amount of time?
Moto (massive, close)
Spec (tiny, far)
Both take the same time
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7. 2. If Moto and Spec switched positions, which planet would complete an orbit in the shortest amount of time?
Spec (tiny, close)
Moto (massive, far)
Both take the same time
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8. 3. What would Moto’s orbital period do if it moved farther away from the central star?
Increase
Decrease
Stay the same
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9. 4. Imagine Moto and Spec orbited the central star at the same distance and never collided (like Jupiter and some asteroids do). Moto and Spec would then have…
Different orbital periods
Same orbital periods
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10. Now for some stand-alone questions on Newton’s Laws.

11. Which of the following is NOT a rewording of one of Newton’s Laws?
Every force has an equal and opposite reaction force.
An object’s acceleration is the overall force on it divided by its mass.
If an object feels no overall force, it remains at rest.
An object moving at constant velocity feels no overall force.
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12. Two identical spacecraft are accelerated by rockets
Two identical spacecraft are accelerated by rockets. The first rocket fires with a force four times greater than the second. The acceleration of the first rocket is how many times as large as the acceleration of the second?
4 times
2 times
None of the above
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