Kepler Planet

# Kepler Planet

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## Kepler Planet

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1. 2.1 Do NowTake 15 minutes to complete the do now. Make sure to write your name, date, and 2.1 on top of your paper. Read the Article “New Planet Discovered Similar to Earth” and fill in what you know about the Kepler planet in the appropriate circle: Kepler Planet Earth

2. Unit 2 Data Tracker

3. Objective EEn.1.1.1 TSW explain the Earth’s motion through space (nutation, barycenter (sun's moving), and precession) by checkpoints and the barycenter lab. EQ: How does the Earth move? What is the difference between precession and nutation?

4. Who is Kepler? On the top of your notes, write down three interesting facts about Johannes Kepler. http://www.youtube.com/watch?v=VB3V36LJpGc

5. Kepler’s Laws Kepler created 3 laws that discussed how our Earth and the planets move. Today we will learn about Kepler’s 1st Law of Planetary motion.

6. Kepler’s 1st Law: Law of Ellipses Planets move in elliptical orbits with the Sun at one focus.

7. Why does the Earth move in an ellipse? • An ellipse is an oval-shaped figure whose shape is determined by 2 foci. • The Sun is at one focus planet’s orbit; the second focus is empty because of the gravitational pull.

8. How does the Earth move? • Rotation • Revolution • Precession • Nutation

9. DAY warmer NIGHT cooler Rotation • Rotates = spins. • 1 rotation=24 hours/ 1 day Looking at the picture below, why is the left hemisphere experiencing a warm day and the right hemisphere experiencing a cooler night?

10. Revolution • Revolves (orbits around) the sun • 1 revolution= 365 days/ 1 year

11. Quick Quiz #1 What is the difference between rotation and revolution? A. Rotation is when the Earth orbits around the sun and Revolution is the Earth spinning. B. Rotation gives Earth 1 year (365 days) and Revolution gives Earth 1 day (24 hrs) C. Rotation is when the Earth spins and Revolution is when the Earth orbits around the Sun. D. Rotation moves in an ellipse and Revolution moves in a circle around the sun.

12. Precession • The change in direction of the axis of the Earth, but without any change in tilt -Like the wobbling motion of a spinning top • 1 precessional cycle: approximately 26,000 years After viewing the videos, write in where you see precession:

13. Just like a spinning top! http://vimeo.com/3110658 http://www.youtube.com/watch?v=AC5HuGGIX7k

14. Quick Quiz #2 Which is the best explanation for precession? • Precession is how the Earth revolves around the sun • Precession is how the Earth spins • Precession takes 1 day to make a rotation • Precession is the change in direction of the Earth’s axis as it rotates

15. Nutation What do you notice about the movement of the Earth?

16. Nutation • The wobbling/swaying motion during the precession of our axis. • This causes a 1 degree change in the tilt of the Earth’s axis.

17. Quick Quiz #3 What is the best explanation of nutation? • The spinning of the Earth • The wobbling of the Earth’s axis • The change in direction of the Earth’s axis • The orbiting of the Earth around the sun

18. Kepler’s 2nd law A planet that speeds up when it is closer to the Sun because of the Sun’s gravitational pull.

19. Animation

20. A planet travels the same distance in the same time and but at differentspeeds (velocities).

21. Identify the following on the picture: which side is faster?

22. Quick Check • Therefore, Earth moves ________________________ (faster/slower) in summer than in winter, so summer in the Northern Hemisphere must be ___________________________ (longer/shorter) than winter. • Isaac Newton later determined that the force of GRAVITY holds the planets in orbit around the Sun. When a planet is closer to the Sun, the force of the Sun’s gravitational attraction on the planet is _________________________ (stronger/weaker) than when the planet is farther from the Sun.

23. Kepler’s law and Barycenter Barycenter- is the center of mass between two points. All bodies (planets, the sun) in our solar system revolve around a barycenter.

24. Center of Mass Unbalanced Balanced

25. So what does this mean? • Yes, the sun is the center of the solar system. • But the sun and planets are BOTH revolving around the barycenter (the center of mass between them).http://en.wikipedia.org/wiki/File:Orbit4.gif

26. Where is the barycenter located? For two objects that are of different masses, the barycenter is CLOSER to the one with MORE mass.

27. Barycenter Lab

28. Barycenter Lab

29. Barycenter Lab

30. Barycenter Lab

31. Barycenter Lab

32. Barycenter Lab Complete the results and conclusion section of your lab write-up. This will be worth a 30 point project grade. Remember to write in complete sentences!

33. Kepler’s 3rd Law of Planetary Motion The time it takes to REVOLVE around the Sun= the distance from the Sun. The farther you are from the sun, the longer it takes to get around the sun.

34. Just like a track!

35. For example: Earth The Earth takes ___________ (longer/shorter) than Mercury to revolve around the sun. The Earth takes _____________ (longer/shorter) than Mars to revolve around the sun.

36. Kepler's third law of planetary motion describes a relationship between the A. Shape of orbit and location of Sun. B. Speed of the Earth and its position in orbit. C. Distance from the sun and length of year.

37. Which of these statements about Kepler's Laws is true? A. A planet moves faster when its orbit is close to the sun. B. The planet travels faster when it is away from the sun. C. Planets travel in circular orbits

38. Exit Ticket Complete the Earth section of the Do Now.