Download Ch 9 Review

Ch 9 Review
Name_______________________________
Date________________________Hour___
1. What was it that Newton discovered about gravity?
2. In what sense does the moon “fall?”
3. What is the magnitude of gravitational force between two 1-kilogram bodies that are 1 meter
apart?
4. What do we call the gravitational force between the Earth and your body?
5. How does the force of gravity between two bodies change when the distance between them is
quadrupled?
6. How does the brightness of light change when a point source of light is brought twice as far away?
7. At what distance from the Earth is the gravitational force on an object zero?
8. Would the springs inside a bathroom scale be more compressed or less compressed if you weighed
yourself in an elevator that moved upward at constant velocity? Downward at constant velocity?
9. Give an example of when your weight is more than mg.
10. Do tides depend more on the strength of gravitational pull or on the difference in strengths?
Explain.
11. Why do both the sun and the moon exert a greater gravitational force on one side of the Earth
than the other?
12. Distinguish between spring tides and neap tides.
13. Does the fact that one side of the moon always faces Earth mean that moon rotates about it axis
(like a top), or doesn’t rotate about its axis?
14. What is the magnitude of the gravitational field at the center of the Earth?
15. What would be the magnitude of the gravitational field anywhere inside a spherical hollow
planet?
16. Newton viewed the path of a planet curving because a force acts on it. How did Einstein view the
curving of a planet?
17. What happens to the strength of the gravitational field at the surface of a star that shrinks?
20. What was the cause of perturbations discovered in the orbit of planet Uranus? What greater
discovery did this lead to?
21. Compare / contrast Einstein’s and Newton’s theories of gravity.
22. Draw and label a diagram of a hole bored through the center of the earth, through which a
person is to “magically” travel, including when a and v are maxed, zero, increasing, decreasing.
What type of motion would you experience if you fell through, making no attempt to grab on to
the opposite side?
23. Know the causes/effects of black holes, including the difference between the gravitational force as
a sun black holes if you are riding the radius in versus staying at the same distance away.
24. If the force of attraction between a 5.401 kg mass and a 3.230 kg mass is 2.177 N, what is the
distance between them?