Physics

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Across
  1. 2. Mass divided by volume.
  2. 5. A pure substance of one atom type.
  3. 9. What snowshoes increase to reduce pressure.
  4. 11. Used to reduce friction, like oil or grease.
  5. 12. The total of protons and neutrons in an atom.
  6. 14. A positively charged particle in atoms.
  7. 15. The energy we feel from the Sun.
  8. 17. The invisible force between charged objects.
Down
  1. 1. The path a planet takes around a star.
  2. 3. The star at the center of our Solar System.
  3. 4. A negatively charged particle in atoms.
  4. 6. The center of an atom.
  5. 7. How much matter an object has.
  6. 8. The force that happens when two surfaces rub.
  7. 10. Force divided by area.
  8. 13. Anything that has mass and takes up space.
  9. 16. Our home planet, supports life.