Oils are used to lubricate any surfaces that would be normally eroded if rubbed together. For example, a squeaking door hinge would be cured (and made silent) if a squirt of oil is used.
Brakes are meant to have a lot of friction and it's useful.
fricton is useful in the cases of deacceleration or tending the body to be at the rest.eg: braking car,trekking,air friction in ski jumping,eraser for rubbing etc. However friction usefulness doesn't hold true in car engines,because it doesnt need fiction so we use oils to reduce it.
Rolling friction is used as a lubricant in place of sliding friction in motor oils. Rolling friction occurs when two surfaces move against each other with rolling motion, reducing friction and wear on the surfaces.
No Friction Runes Computers
the friction from pushing the hull through the water is not useful as long as you're travelling.
It can be useful when a ball is catching
how does friction help car tyres?
Sandpaper is high in friction but is not considered useful in terms of being helpful in a general sense.
stopping cars Friction is useful to start a fire with sticks.
Friction is useful when you are trying to stop a car, but not useful in the pistons of a car's engine (It makes them less efficient).
It is useful
there is friction in your cars brake system and without that frictiuon there your car would roll away whenever it was on a hill so this is a good example of when friction is useful.