Friction is used for many many things. it is used for mostly for science and physics.
Everywhere, for example sitting on your chair, walking, using a mode of transport.
Lubrication stops friction. If you put lubricant on a surface, there should be no friction
Friction is not reduced by trying to move anything which has, or is moved upon, a rough surface. Sand would not help a motor engine to run if it entered the cylinders or wheel bearings.Friction can...
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