practice

1. Write something.
2. Write something.
3. Write something.
4. Write something completely different.

conceptual

1. Classify the motion of the following objects using the scheme described in this section.
   1. ant
   2. arrow
   3. bullet
   4. compact disc
   5. drop forge
   6. electron
   7. fan blade
   8. honeybee
   9. housefly
   10. library book
   11. ocean current
   12. pencil
   13. satellite
   14. sewage
   15. stapler
   16. typewriter key
   17. washing machine
   18. weather balloon