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Published byRaymond York Modified over 5 years ago
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The Normal Force The normal force is a force that opposes the Earth’s gravitational attraction and is perpendicular to the surface that an object rests or is moving on. For a horizontal surface, FN = Fg = mg. For a surface that is not perpendicular to gravity, FN = Fgcos FN
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The Normal Force = 0 FN FN Fg Fg FN = Fg = mg
Is there any component of gravity parallel to the surface?
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The Normal Force = 90 FN Fg What is the force of friction?
What is the normal force equal to? How much of the force of gravity is directed parallel to the plane?
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The Normal Force FN FN Fg Fg FN = Fg = mg FN = Fg cos = mg cos
cos = adj/hyp Fg FN = Fg = mg FN = Fg cos = mg cos
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Given a block on an inclined plane, show how the force diagram relates to the physical representation. FN = Normal Force 1 1 Fg,h = Component of acceleration of gravity parallel to the plane FN 2 2 Fg = mg = weight Fg,v = Component of acceleration of gravity perpendicular to the plane Force Diagram 2 Fg Note that Fg,y is equal in magnitude to the Normal force, but of opposite direction. FN = Fg,y = Fg cos (angle 2) Fg,p = Fg sin (angle 2) Fg,v Fg,h
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The Normal Force FN = Fg cos = mg cos FN FN Fg Fg FN = Fg = mg
cos = adj/hyp Fg FN = Fg = mg Fg,x = Fg sin = mg sin
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