hard place has more friction and smooth place has less friction
No, sand does not reduce friction but increase 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.
It is so because the sand causes friction. So it slows down. Water in the sea has much less friction, that is why the boat just races along the water.
hard place has more friction and smooth place has less friction
No, sand does not reduce friction but increase 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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it has much friction between the particles of sand and blood cells and blood cells are more concentrated than sand thats why sand and blood cells can not be filtrated. Sand consists of beeds so this beeds actually bring about this more 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