1. Protons = positive, electrons = negative
  2. like = repel; opposite = attract
  3. the force increases
  4. 40 k-N
  5. 5 k-N
  6. charges are only transferred; never created or destroyed
  7. electrons are not free to move; rubber, wood, pure water
  8. electrons are free to move; gold, silver, copper
  9. a metal bridge because it diverts lightning around the inside
  10. both
  11. spread out
  12. when an insulator has a positive side and a negative side but is overall neutral
  13. water, balloon sticking to a wall
  14. coulombs
  15. same size (newtons third law)
  16. 38.5 k-N
  17. 6 m
  18. 2.2 k-N
  19. 3.22 m
  20. 2.9 m
  21. 6.9 k-N left
  22. 16.3 k-N right
  23. 9.4 k-N left
  24. 28.8 k-N right
  25. 21.8 k-N left
  26. 7 k-N left
  27. 5x hotter
  28. fire