A book is resting on a table. A student draws a correct free-body force diagram for the book as shown below. The student makes the incorrect statement that “The forces labelled above make a Newton third law pair; therefore the book is in equilibrium”

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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!