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. (a) What minimum force do you need to apply to keep the book from slipping down the wall? Give your answer in units of Newtons. Assume you are applying the force horizontally. (b) Now suppose you are pushing the book at an angle of 37.5 ̊ above the horizontal. Now what is the minimum force you need to apply to keep the book from slipping down the wall? Give your answer in units of Newtons.

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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!