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1. without friction, we cannot hold objects in our hands; we cannot walk and cannot light a match stick. Sometimes friction is not desirable, for example friction between machinery parts, which causes wear and tear.
2.When you rub your hands together, the action of scraping the surface of your skin back and forth against each other causes the molecules in your skin to move a little faster. The faster that molecules move, the higher the temperature. So the friction of rubbing your hands together makes them feel warmer.
3.Airplanes have wings, just like birds. They also have a light skeleton (or framework) to decrease their weight, and they have a streamlined shape to decrease drag. ... Airplane wings are designed to create lift by changing the pressure, rather than by flapping them up and down.
4.Make the surfaces smoother and Roll the bodies instead of sliding them.
5.mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction.
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