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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) θ m g N x y N m g θ θ y x Using Newton’s 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 θ = ma x N − mg cos = ma y = a x = g sin N = mg cos If θ → 0°, a x = 0 and N = mg • If θ → 90°, a x = g, N = 0...
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This note was uploaded on 12/10/2011 for the course PHY 1111 taught by Professor Stencil during the Fall '11 term at UGA.
 Fall '11
 Stencil
 Force

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