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Friction can be harmful or helpful
Transcript of Friction can be harmful or helpful
How does friction affect a car?
-without friction the tires could not push against the ground to move the car forward and the brakes could not stop the car.
-Friction can cause problems
-friction between the engine parts increases the temperature and causes parts to wear down. you need to add a coolant to keep it from overheating
Friction harmful and helpful in the real world
-holes in your socks and holes at the knee of your jeans.
-friction between your pencil and paper.
Sometimes necessary to reduce or increase friction
-one way to reduce friction is to use lubricants
-lubricants are substances that are applied to surfaces to reduce friction between them.
Example- motor oil, wax, grease
-you can reduce friction to make surfaces that rub against each other smoother.
Example- if a bench has rough wood it is painful for you to slide across it. If we sand down the wood it makes it smooth and more comfortable to slide across.
-make the surface rougher.
-example-sand scattered on icy roads keeps cars from slipping.
increase the forcepushing the surface together.
example- to ensure that your magazine does not blow away at the park you put a rock on top of it.