Consider these two cases for the following two questions: (1) a book sits at rest on a table, touching only the table, and (2) a string pulls up on a book which is at rest on a table.   1. The magnitude of the normal force of the table on the book in (1) is _______ the magnitude of the normal force of the table on the book in (2). 2. The direction of the normal force of the table on the book in (1) is in the _______  direction as the normal force of the table on the book in (2).

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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!