Review Crossword

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Across
  1. 1. the force between two surfaces that are sliding or trying to slide across each other
  2. 3. a celestial body in an elliptical orbit around a star.
  3. 4. the amount of matter a substance contains
  4. 8. a substance formed from two or more element any substance that cannot be decomposed into simpler substances
  5. 9. the force that attacks a body toward the center of the earth
  6. 10. a force of all the gas particles colliding
  7. 11. d=m/v
  8. 13. the basic unit of chemical element
  9. 15. the force acting on the object due to conductor a object that allows the flow of energy
  10. 16. center core of an atom
  11. 18. the collection of 8 planets and their moons in orbit around the sun
  12. 20. the speed of something in a given direction
  13. 21. orbital motion around an object
  14. 22. energy of an object at rest
  15. 24. the processes which heat or electricity id directly transmitted through a substance
  16. 25. the result of a negative and positive object
Down
  1. 2. energy contained within a system that is responsible for its temperature
  2. 5. energy of an object in motion
  3. 6. activity involving physical/mental effort
  4. 7. circular movement around a object around a center
  5. 12. a vehicle used for space travel
  6. 14. the gases surrounding the earth or another planets
  7. 17. a number placed in front of a chemical symbol
  8. 19. a group of atoms bonded together
  9. 23. an imaginary line going through the earth