200

1. Gravity Falling Through the Earth! Riding In an Elevator Tides Black Holes 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

2. What is the kind of force field that surrounds massive objects?

3. Gravitational Field

4. On the moon, your___changes, but your___stays the same.

5. Weight; Mass

6. Gravity depends upon the ___ and ___ of a planet.

7. Mass; Radius

8. If the mass of the earth were greater, would gravity of earth be greater?

9. yes

10. If the radius of the earth were greater, would the gravity of earth be greater?

11. No

12. If you fell through the middle of the earth, when would your acceleration equal zero?

13. Center of the earth

14. You have ___ acceleration at the center of the earth because the earth is pulling you in all directions.

15. No

16. When is your acceleration the greatest?

17. At the surface of the earth

18. When is your speed the greatest?

19. At the center of the earth

20. If this hypothetical situation was possible, you would ___ stop.

21. Never

22. If you’re standing on a scale, by Newton’s ___ law, the floor and scale ___ on you.

23. Third; Pushes

24. Your weight will vary not during ___ ___ but during ___ ___.

25. Steady motion; Accelerated motion

26. Your weight is more when you accelerate ___ and less when you accelerate ___.

27. Upward; Downward

28. You experience weightlessness when you are in ___ ___.

29. Free fall

30. To experience true weightlessness, you would have to be far out in space with a negligible ____ force.

31. Gravitational

32. ___ occur due to the gravitational pull the moon has on the earth.

33. Tides

34. When the sun, earth, and moon are all lined up, and tides are more extreme than usual, ___ ___ occur.

35. Spring tides

36. A ___ ___ is produced when the earth is directly between the sun and moon, and a ___ ___ occurs when the moon is directly between the sun and earth.

37. Lunar eclipse; solar eclipse

38. During a neap tide, the sun and moon partly ___ each other and the tides are less ___ than usual.

39. Cancel; extreme

40. The tilt of the earth causes the daily high tides to be ___.

41. Unequal

42. Black holes occur when ___ is so great in an area that nothing can escape.

43. gravity

44. If the sun runs out of fusion fuel, the sun will ___.

45. Collapse

46. If the sun became a red giant, it would ___ the earth.

47. Swallow

48. For tars with masses of more than four solar masses, ___ ___ will eventually turn it into a black hole

49. Gravitational collapse

50. Astronauts can escape black holes, but only before a certain ___.