Physics

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Across
  1. 3. quantity of matter
  2. 5. a transfer in energy
  3. 7. charged particles such as electrons or protons
  4. 9. the lowest point of a wave
Down
  1. 1. the middle of a wavelength
  2. 2. a force that pulls a body towards the center of the earth
  3. 4. a push or pull
  4. 5. how heavy something is
  5. 6. the strength required to sustain physical activity
  6. 8. the highest point of a wave