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The proton motive force arises from a combination of the concentration gradient of protons and a voltage gradient across the membrane (the protons are positively charged, so an imbalance of protons means that the side of the membrane with more protons has a positive charge relative to the side with fewer protons).
However, protons repel, or push away from other protons, and electrons push away from other electrons. These forces-attractions and repulsions-make static electricity. Students might also say that static electricity is created when two objects are rubbed together, causing an object to give up or gain electrons. This can happen by putting on a sweater, walking on a carpet, or getting out of a car.