Teaching Physics with the Physics Suite

Edward F. Redish

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Why bother with N2?

Newton's second law written in equation form states


Your roommate says “That's silly. Everyone knows it takes a force to keep something going at a constant velocity, even when there's no acceleration.” Do you agree with your roommate? If so, explain why physics classes bother to teach the law. If you disagree, how would you try to convince your roommate of the error of his/her ways?

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Page last modified October 11, 2002: D17