Forces, Motion, and Review

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Across
  1. 2. an atom with an electric charge
  2. 3. a measure of the amount of matter in an object
  3. 8. a pure substance that cannot be broken down into any other substances by chemical or physical means
  4. 9. anything that has mass and takes up space
  5. 11. the tendency of an object to resist a change in motion
  6. 13. a substance that freely flows
  7. 14. a force that pulls objects toward each other
  8. 15. atoms with the same number of protons but different numbers of neutrons
  9. 17. the combination of forces acting on an object
  10. 20. speed in a given direction
  11. 22. an object is in ______ if it changes position relative to a reference point
  12. 23. a form of energy that travels through space as waves
  13. 24. when the only force acting on an object is gravity
  14. 25. a push or a pull
  15. 26. the SI unit of force
  16. 27. the force that two surfaces exert on each other when they rub against each other
  17. 29. energy of matter in motion
  18. 30. mass the average mass of all the isotopes of an element
  19. 31. the SI unit of length
  20. 33. the rate at which velocity changes
Down
  1. 1. the amount of a substance in a given volume
  2. 4. the distance an object travels per unit of time
  3. 5. the greatest speed a falling object reaches, when air resistance equals the weight of the object
  4. 6. the study of the properties of matter and how matter changes
  5. 7. a place or object used for comparison to determine if something is in motion
  6. 10. the force of gravity on a person or object at the surface of a planet
  7. 12. a type of fluid friction objects experience when falling through an atmosphere
  8. 16. the steepness of a line on a graph
  9. 18. the spontaneous emission of radiation by an unstable atomic nucleus
  10. 19. energy an object has because of its position
  11. 21. a measure of the average energy or random motion of particles of matter
  12. 28. a rapid reaction between oxygen and a fuel
  13. 32. empty space