box full of books rests on a wooden floor. The normal force the floor exerts on the box is 282 N. a. see attached b. If you must push horizontally on the box with a force of at least 150 N to start it sliding, what is the coefficient of static friction? c. Once the box is sliding, you only have to push with a force of 120 N to keep it sliding at constant

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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!