6. Friction between two surfaces in contact may be lessened by changing sliding frictior friction and by reducing Kiretic the surfaces in to contact. 7. If a force of 25 lb. is needed to pull a 500 lb. weight across a tabletop, what is the coefficient of friction between the surface of the weight and that of the tabletop? 8. If the coefficient of friction between a tabletop and a certain metal is 0.150, what fc is needed to pull a 275g weight made of this metal across the tabletop at a uniform rate

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!