1. This power point and most of our Unit 1 and 2 materials were created by Mr. Gord and adapted for our class.

2. Grab a handout packet & calculator
you may need to share calculators, we are using Mrs. Starr’s calculators so please treat them with respect. You may use your own calculator.
Today’s Topic: Earth’s Motion
Goals
Define Rotation
Calculate Earth’s Rate of Rotation at various Latitudes
Identify direction of Earth’s Rotation
Compare Earth’s Rotational Period to other Planets.

3. Rotation defined…
Spinning of one object around its own axis.

4. Effects of Rotation Rising and Setting of celestial objects Night, day
Coriolis Effect (swirling, curving, deflecting winds around a low pressure system – like a hurricane)
Oblate Spheroid

5. Northern Hemisphere
Southern Hemisphere

6. Rotation proof…
Foucault Pendulum Proves Earth’s Rotation

7. Foucault Pendulum
Device conceived as an experiment to demonstrate the rotation of the Earth.
The introduction of the Foucault pendulum in 1851 was the first simple proof of the rotation in an easy-to-see experiment.
Today, they are popular displays in science museums and universities.

9. Foucault pendulum

13. Houston Museum of Natural Science

14. Foucault Pendulum
Ann Arbor Hands-On Science Museum Floor, 2nd Floor

15. Rotation is unique? All planets rotate.
All planets rotate at their individual rate

16. Earth’s Direction of rotation
Earth’s Direction of Rotation is…
West to East, CCW (NP), CW (SP)

17. Earth’s Period of Rotation is …
(ABOUT 24 hrs)

18. Viewed from N.P.

19. Lines of Latitude when viewed from Above N.P.

20. Lines of Latitude when viewed from Above S.P.

21. Calculate the rate of Earth’s rotation at various latitudes

22. At the equator
At 0o latitude, on the equator, if each degree of longitude is separated by approx. 70 miles
I need to see work/calculations that justify the answers.

23. On a clean sheet of paper
Calculate the rate of Earth’s rotation at various latitudes…
I need to see work/calculations that justify the answers.

24. At 0, 20, 40, 70, 90o
0 = circ is 25, 000 miles
20 = 23, 400 mi
40 = 19,080 mi
70 = 8,640 mi
90 = ?
What part of the Earth is rotating the fastest?
Write a sentence that shows the relationship between latitude and rotational speed?

25. Assignment
Using Page 577. Calculate the rotational speed of each of the planets at their equator? Answer in mi/hour. I need to see the work/calculations!
A. Which planet rotates the fastest?
B. Which Planet rotates the slowest?
C. Is there a pattern? Describe.
D. What do you think the SHAPE of Jupiter is? Why?