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hard place has more friction and smooth place has less friction
You can change friction by the material. e.g ice, low friction. carpet high friction.Or you could add a lubricant :D
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If there is more friction with a machine, efficiency is less.
more friction = less speed
hard place has more friction and smooth place has less friction
You can change friction by the material. e.g ice, low friction. carpet high friction.Or you could add a lubricant :D
more
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Rolling friction generates considerably less heat than sliding friction. .
than what?
less
Rubber will have a high coefficient of friction on most surfaces, but we cannot know whether there is more or less friction unless we have something to compare it to.
If there is more friction with a machine, efficiency is less.
more friction = less speed
You want less friction. Then you will go faster.
Less heat