Across
- 4. the sum of potential energy and kinetic energy in a system of objects
 - 8. the conversion of energy from one form to another
 - 9. energy carried by sound waves
 - 13. the perception of how high or low sound seems
 - 14. a form of kinetic energy that an electric current carries
 - 15. material through which light does not pass through
 - 16. states that energy can be transformed but cannot be created or destroyed
 - 19. the ability to cause a change
 - 22. a wave in which particles move in the same directions as the wave
 - 24. the sum of kinetic energy and potential energy of particles that make up an object
 - 25. stored in and released from the nucleus of an atom
 
Down
- 1. stored in and released from the bonds between atoms
 - 2. a narrow beam of light that travels in a straight line
 - 3. transferred by waves moving through the ground
 - 5. allows most light to pass through but forms a blurry image
 - 6. the transfer of energy that occurs when a force makes an object move in the direction of the force
 - 7. stored energy that depends on the interaction of objects, particles, or atoms
 - 9. a longitudinal wave that can travel only through the medium
 - 10. reflected sound wave
 - 11. object that has energy because it is in motion
 - 12. to change form or structure
 - 17. allows almost all light to pass through and forms a clear image
 - 18. carried by electromagnetic waves
 - 20. a wave in which particles move perpendicular to the direction of its source
 - 21. space that contains no matter
 - 23. source of something that emits light
 
