Units Puzzle

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Across
  1. 5. A long stick measures these
  2. 6. You tune a radio to this unit for frequency
  3. 9. Roughly the weight of a paper clip
  4. 10. An apple fell on his head
  5. 11. Measures a football field
  6. 12. 100 of these make a dollar
  7. 13. 5280 Feet
  8. 15. 1000 grams
Down
  1. 1. You have two of these, measures length
  2. 2. Water freezes at 32 degrees at this temperature
  3. 3. For each/Division
  4. 4. Unit of time, moves slower when you look at it >:)
  5. 7. Forces the wheels of a car to twist
  6. 8. A unit for electrical power
  7. 12. Water freezes at 0 degrees at this temperature
  8. 14. A difference in electrical potential