Work, Energy, Motion

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Across
  1. 1. I measure energy and work—what am I?
  2. 4. I keep your feet on the ground and pull things down—what am I?
  3. 7. I happen when something changes position—what am I?
  4. 10. I am the unit used to measure force—what am I?
  5. 11. I tell how well something works compared to effort used—what am I?
  6. 13. I am energy in motion, like a rolling ball—what am I?
  7. 14. I am stored energy, like at the top of a hill—what am I?
  8. 15. I happen when a force makes something move—what am I?
Down
  1. 2. I give you the ability to move or do things—what am I?
  2. 3. I push back and make it harder for things to move—what am I?
  3. 5. I measure how far you travel from one place to another—what am I?
  4. 6. I keep things still or moving unless something makes them change—what am I?
  5. 8. I tell how fast you go when you run or ride—what am I?
  6. 9. I’m a push or a pull you use every day—what am I?
  7. 12. I slow you down when you slide across the floor—what am I?