What causes static electricity and the interaction between charged materials?

Here is the completed concept map for static electricity:

• Static electricity results from rubbing which is friction between materials with static charges.
• Friction transfers electrons (and NOT protons) between the two atoms.
• This transfer results in:
  • The surface of one material (due to loss of electrons) becoming positively charged.
  • The surface of other material (due to gain in electrons) becoming negatively charged.
• Materials with static charges will either:
  • attract each other (if they have opposite charges, as shown by the two different charged surfaces).
  • repel each other (if they have same charges).

Here are the specific answers for each blank:

1. The blank after "materials with" (top right, leading to attract/repel): static charges
2. The blank after "and NOT" (middle, parallel to electrons): protons
3. The blank after "surface of one material becoming" (left, due to loss of electrons): positively charged
4. The blank after "surface of other material becoming" (bottom left, due to gain in electrons): negatively charged
5. The blank after "materials with" (bottom right, leading to repel): same charges