Physics crossword

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Across
  1. 3. The rate at which work is done.
  2. 4. Atoms with the same number of protons but different numbers of neutrons.
  3. 6. The force of gravity on an object
  4. 7. The measure of how quickly/slowly something change over time.
  5. 8. The amount of matter in an object.
  6. 10. State of balance between all parts of a system.
  7. 12. Takes place with any change in velocity.
  8. 13. A pull or push that is applied to an object.
  9. 15. It is the equivalent of mass times velocity.
  10. 17. Describes the speed and direction of the motion of an object.
  11. 18. A negatively charged subatomic particle.
  12. 19. A positively charged subatomic particle.
Down
  1. 1. The direct effect that one kind of particle has on another.
  2. 2. An objects resistance to a change in motion.
  3. 3. The force per unit area exerted on an object.
  4. 5. How fast an object or person is moving.
  5. 9. Relating to a process that occurs within an atom.
  6. 11. The change in momentum.
  7. 14. To maintain at a constant overall total.
  8. 16. Isaac Newton invented many discoveries.