A 50-N crate sits on a horizontal floor where the coefficient of static friction between the crate and the floor is 0.50.A 20-N force is applied to the crate acting to the right. What is the resulting static friction force acting on the crate?(a) 20 N to the right.(b) 20 N to the left.(c) 25 N to the right.(d) 25 N to the left.(e) None of the above; the crate starts to move.

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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!