A 10-kg block is at rest on a level surface, where the coefficient of static friction is 0.8 and that for kinetic friction is 0.3. A 60-N horizontal force is applied. The frictional force on the block is a) 78.4 N b) 29.4 N c) 18.4 N d) 60 N

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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!