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Unformatted text preview: nd law gives: F y = N mg = 0 or N = mg = W N mg Demos 4 and 7 If elevator is accelerating? F y = N mg = ma or N = mg + ma N = m ( g + a ) If a > 0, N > mg If a < 0, N < mg If a = g, N = 0 (weightless) Book on an Incline (Frictionless) m g N x y N m g y x Using Newtons 2 nd Law, find the normal force and the acceleration of the book As we did for 2D kinematics, break problem into x and ycomponents = = y y x x ma F ma F FBD mg sin = ma x N mg cos = ma y = a x = g sin N = mg cos If 0, a x = 0 and N = mg If 90, a x = g, N = 0...
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 Fall '11
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