1. 42L: Galaxy Clip (first third)
What do you see?
What questions do you have?

2. Gravity and orbits phet

3. 42 L: What do you see? What questions do you have?
ch?v=aq4etCTg_WY&pbjreload= 10
/watch?v=2I8PVoYY4mU

4. Gravity

5. GRavity and Orbits Basics
Directions: Play with simulation and try to find the answer to the following questions:
What do the blue and red arrows represent?
Are the blue arrows always the same size or different?
Which of Newton’s laws helps to explain the size comparison between the arrow coming from the Sun and the arrow coming from the moon?
Turn gravity on and off...what happens/changes?
Is gravity a force that pushes or pulls? Explain.

6. GRavity and Orbits Basics: Discussion
Person A: What do the blue and red arrows represent?
Person B: Are the blue arrows always the same size or different?
Person A/B: Which of Newton’s laws helps to explain the size comparison between the arrow coming from the Sun and the arrow coming from the moon?
Person A: Turn gravity on and off...what happens/Changes?
Person B: Is gravity a force that pushes or pulls. Explain.

7. GRavity Notes (first third)
An attractive force that pulls
The force of attraction is always equal and opposite.

8. What can you do to increase or decrease the gravitational force
What can you do to increase or decrease the gravitational force? (what makes the blue arrows get larger/smaller)

9. 42 L What causes more or less gravity? 2nd third
Increase Gravity:
Decrease Gravity:

10. Patterns with gravity:
Discuss with your groups any patterns you see that might be related to gravity
Sentence Stem: When the surface gravity increases _____ will increase/decrease.

11. When Surface gravity increases on a planet . . .

12. 42L/ R How does gravity affect our solar system? 3rd third
When the gravity of a planet increases (due to _______) the planet is more likely to . . .
Give evidence/data from the cards to prove your statement

13. Patterns with gravity:
Discuss with your groups any patterns you see that might be related to gravity
Sentence Stem: The planets closer to the Sun are affected by Sun’s gravity . . .

14. The closer the planet is to the sun. . .

15. 42 l/R How does gravity affect our solar system? 3rd third
When the gravity of a planet increases (due to mass) the planet is more likely to .. .
Give evidence/data from the cards to prove your statement
The closer the planets are to the Sun the ________ (MORE/LESS) the gravitational force (due to ___________________) affects planets . ..

16. Go back to gravity and orbits
Go back to gravity and orbits...Find evidence to answer the following questions...
Why would a planet with more mass have more moons?
Why would a planet closer to the Sun have longer days than a planet further away?

17. CER- GRavity
What two variables increase the gravitational attraction between two objects?
Claim: (answer the question above)
Sentence frame: The two variables that can increase gravity are . . .
Evidence (variable 1 _______)
Use at least 2 pieces of evidence...
Possible sentence starter:
In the card sort activity. . .
In gravity and orbits . . .
In the gravity demo clip . .
Evidence (variable 2 ________)
Use at least 2 pieces of evidence . .

18. 42L/ R Gravity well:
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DRAW WHAT THE GRAVITY WELL/DENT FOR THE EARTH MOON YOU MIGHT LOOK LIKE.
What new idea does this demonstration show you about gravity?
Moves fast enough or it will go towards weight
Earth moon
Sun earth moon
2luto and moon
Clumping

21. 42 L: What do you see? What questions do you have?
ch?v=aq4etCTg_WY&pbjreload= 10
/watch?v=2I8PVoYY4mU

22. What are gravitational waves?
Why important:

23. ApplicatioN: Discuss- How does gravity help to explain. . .
ch?v=aq4etCTg_WY&pbjreload= 10
/watch?v=2I8PVoYY4mU

24. Exit ticket What was most challenging to you about today?
What was the most confusing to you regarding material explored in class today?
What questions arose today that you had not considered before?

25. If Absent .. . helpful clip
Article:
Gravitational waves discovered Sept 2017:

26. Gravity is turned off here….

28. (Assuming each star has the same density)