You can hold a book against the wall, preventing it from sliding down, if you press your hand against it. Suppose the coefficient of static friction between the book and the wall is 0.450, but there is no friction between your hand and the book. The mass of your book is 3.75 kg. What minimum force (P) do you need to apply to keep the book from slipping down the wall? Give your answer in units of Newtons. Hint: apply Newton's 2nd law to the book, and set the acceleration equal to zero, since it is not moving! P

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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!