1. Be careful not to rub against the wet paint.

2. These shoes rub against my heels.

3. She watched her bare toe rub against the whitened concrete of the balcony.

4. During these movements the object happens to rub against the wicker of the bassinet.

5. She interrupts her naps to rub against a tree, and that only when the mood hits her.

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6. When object rub against each other, static electricity is produced.

7. Volcanic lightning occurs when roiling ash particles rub against each other and become electrically charged.

8. She opened the door gently so as not to rub against the wet paint.

9. These days rucksacks are made with specially padded straps so that they do not rub against the shoulders.

10. Trichiasis is a condition in which the eyelid turns inward and eyelashes rub against the eye.

11. What will be produced when two different kinds of insulators rub against each other?

12. This is when the complexity of relational databases starts to rub against their potential to scale.