Unit 4 Vocabulary

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Across
  1. 4. : The force that one surface exerts on another when the two surfaces rub against each other
  2. 5. : A type of energy that travels in waves and is able to be heard
  3. 8. : A material that does not allow heat or electrons to move through it easily.
  4. 10. circuit : A complete path through which electric current can flow
  5. 12. : A material that allows light to pass through without scattering light.
  6. 13. : Allowing light to pass through
  7. 15. : Bending of light
  8. 16. : A special kind of natural or artificial energy that makes it possible for us to see
  9. 17. : Ability to do work
Down
  1. 1. : Energy from heat
  2. 2. : A push or pull
  3. 3. : A device designed to transmit electricity, heat, etc.
  4. 5. : Energy from the sun
  5. 6. : Impossible to see through; preventing the passage of light
  6. 7. : A repeated back-and-forth or up-and-down motion
  7. 9. : The flow of electrical power or charge.
  8. 11. : The amount of light being bounced back
  9. 14. : A force that pulls objects toward each other