Forces, Motion, and Review

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