Chapter 15 Vocabulary

5. motion, The change in one object's position compared to another object's position is __________.
6. Earth moves in a __________ path.
8. Distance divided by time equals what?
10. A push or pull.
11. Back and forth motions are known as __________.
14. All forces have both size and __________.
15. A __________ has a force that can act on iron at a distance.

1. The speed and direction the object is moving.
2. of reference, How an object seems to move depends on your __________.
3. __________ are those that are opposite in direction and equal in size.
4. Any change in the speed or direction of an object's motion is __________.
7. If you kick a football and it moves from one place to another, it means that __________ forces are acting upon it.
8. The rate at which an object changes position.
9. Speed measures how fast an object __________.
12. line, How would a baseball player running to home plate likely move?
13. What do you call an object that does not move?