4. Friction _________moving things and turns motion energy
into _________.
5. In _________ there is almost no friction.
6. Your fingerprints are necessary for you to _________ things.
7. Friction comes from _________.
8. The more electrons repel each other the _________friction there is.
9. When skis or skates slide over ice or snow the friction creates a layer of _________which _________.