forces and motion

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Across
  1. 1. force / a force
  2. 5. / speed in 1 direction
  3. 7. / newtons 2 law
  4. 9. force / a force acting against the action force
  5. 13. / newtons 1 law
  6. 14. / blank a wagon
  7. 16. / to work hard
  8. 18. / distance divided by time
Down
  1. 2. / a unit of measurement
  2. 3. force / all of the forces together
  3. 4. / the top
  4. 6. machine / many simple machines together
  5. 8. / a force that creates heat and stops objects
  6. 10. / a force that pulls us toward earth
  7. 11. machine / any basic mechanical device
  8. 12. / equal to 1 newton
  9. 15. / to make effort
  10. 17. / newtons 3 law
  11. 19. / blank a soccer ball