puzzle

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Across
  1. 4. - measure o0f average kinetic energy
  2. 8. - attractive force
  3. 10. - force applied to move an object
  4. 11. distance and direction of the object's motion
  5. 13. - force that stops sliding
  6. 15. - product of mass and velocity
  7. 16. - energy transferred between objects
  8. 18. - tendency of change
  9. 19. energy - kinetic and potential energy
Down
  1. 1. - makes work easy
  2. 2. insulator - cooler
  3. 3. - speed and direction of an object
  4. 5. - change in an object's place
  5. 6. - transfer of thermal energy by touch
  6. 7. - transfer of thermal energy by liquid
  7. 9. - rate of change in velocity
  8. 12. - push or pull
  9. 14. - transfer of energy by the sun
  10. 17. - gravitational pull
  11. 20. - a way cables are arranged on a cable stayed bridge