Physical Science

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Across
  1. 3. A particle with a positive charge.
  2. 6. The same as speed.
  3. 7. A subatomic particle found in all atoms.
  4. 9. A source of energy associated primarily with electrons.
  5. 10. A resistance that one surface or object encounters when moving over one another.
Down
  1. 1. A source of illumination.
  2. 2. A class of things of the same kind and with the same name.
  3. 4. Disturbances that transfer energy.
  4. 5. Caused by atoms moving quickly together.
  5. 8. A particle with no charge.