PROBLEM: How do the Earth and Moon move in space?

PREDICTION 

PROCEDURE: Go to the 4 stations and complete the following experiments.

STATION A:
MATERIALS - stretchy substance, revolving styrofoam ball.

1. Experiment with the revolving styrofoam ball. When can you get an elliptical orbit to form? 
    
2. When can you get a circular orbit to form?
    
3. What type of orbit does the Moon have around the Earth? Why?
    
4. What force keeps the Moon and Earth together?

STATION B:
MATERIALS - plain styrofoam ball, styrofoam ball with pin

5.  Try to roll the plain styrofoam ball. Now try to roll the ball with the pin in it. Draw the path of each below. Why does this happen?

STATION C:
MATERIALS - 2 styrofoam balls with handles

6. Which one of these models represents the Moon? 
    
7. Which model represents the Earth? 
    
8. Revolve the Moon ball around the Earth ball while rotating both of them. Have your teacher watch your movements. Have them initial that you have done the revolution and rotation correctly. 

STATION D.
MATERIALS - Planetarium

9. After what your instructor has taught you about planets and the Earth and the Moon, can you find anything wrong with this model?

CONCLUSION: Describe how the Earth and Moon move in space with regards to the Sun.