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A classroom demonstration of Newton's fi...

A classroom demonstration of Newton's first law is as follows: A glass is covered with a plastic card and a coin is placed on the card. The card is given a quick strike and the coin falls in the glass. a.Should the friction coeficient between the card and the coin be small or large? b. Should the coin be light or heavy? c. Why does the experiment fail ifteh card is gently pushed?

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