1) The force that acting on the opposite direction of a moving object is called ___________. 2) The force of friction is _________ when the rough surface and _________ when the smooth surface is involved.3) The substance which reduce friction are called ___________. 4) When one body rolls over the surface of another body, the resistance to it's motion is called __________.5) The frictional force exerted by fluids is also called __________.

1) The force that acting on the opposite direction of a moving object

1.	1) The force that acting on the opposite direction of a moving object is called ___________. 2) The force of friction is _________ when the rough surface and _________ when the smooth surface is involved.3) The substance which reduce friction are called ___________. 4) When one body rolls over the surface of another body, the resistance to it's motion is called __________.5) The frictional force exerted by fluids is also called __________.
Answer» FRICTION LESS more LUBRICANT ROLLING friction DRAG

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