FORCE and ENERGY

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Across
  1. 4. the force that opposes motion
  2. 7. unit of energy
  3. 8. force x displacement
  4. 9. unit of mass
  5. 12. unit of force
  6. 13. another name for air resistance
  7. 14. when the forces cancel out
  8. 15. a unit of displacement
  9. 16. the ability to do work
  10. 18. straight up or down
Down
  1. 1. a push or a pull
  2. 2. flat and level
  3. 3. energy of motion
  4. 5. energy of position
  5. 6. a unit of time
  6. 10. the steepness of a line
  7. 11. rate of change of velocity
  8. 17. it gives weight to mass