PHYSICAL SCIENCE REVIEW

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Across
  1. 4. Electric current that flows in only one direction.
  2. 7. The push of a power source supplies to the charge
  3. 9. This machine changes rotational motion into vertical motion.
  4. 11. A change in sound frequency caused by the sound source's motion, the listener's motion, or both.
  5. 12. The horizontal distance between the crests or between the troughs of two adjacent waves
  6. 14. Amount of charge flowing through the circuit.
  7. 15. This machine uses a fulcrum.
  8. 16. Number of waves per second. The unit is Hertz (Hz)
  9. 18. A part in a longitudinal wave where the particles are spread apart
  10. 19. A logarithmic unit of sound intensity.
  11. 21. A wave in which the particles of the medium vibrate parallel to the direction of the wave motion
Down
  1. 1. The opposition to the flow of charge through an electric circuit.
  2. 2. This machine uses a grooved wheel to change the direction of the force.
  3. 3. A disturbance in a medium that transfers energy from place to place
  4. 5. The part of a longitudinal wave where the particles of the medium are close together.
  5. 6. A wave in which the particles of the medium move perpendicularly to the direction the wave travels.
  6. 8. An electric circuit with a single path.
  7. 10. Type of current where the direction of flow alternates between forward and backward.
  8. 12. A doorknob is an example of this type of simple machine.
  9. 13. The quality of a sound that distinguishes one voice or instrument from another
  10. 17. This machine makes vertical motion easier by increasing the horizontal motion
  11. 20. A circuit composed of both, parallel and series circuits.