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Constructing Free-Body Diagrams A Step-by-Step Method modeled on the multiple representation technique of Dr. Alan Van Heuvelan at Rutgers University Separating the universe into point models of objects and force vector models of everything else Leo Takahashi The Beaver Campus of The Pennsylvania State University

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Constructing Free-Body Diagrams for Interacting Objects Featuring Newton’s Third Law L. H. Takahashi, August 2007

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m M v v a a m

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M m v v a FBD Block mg F F N1 f k1 FTFT FBD Slab Mg F N1 FTFT f k1 F N2 f k2 a

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FBD Block mg F F N1 f k1 a FBD Slab Mg F N1 FTFT f k1 F N2 f k2 a FTFT

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FBD Block mg F F N1 f k1 FTFT a +X +y F x = ma x F y = ma y FCos - F T – f k1 = ma F N1 + FSin - mg = 0

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FBD Slab Mg F N1 FTFT f k1 +y F N2 f k2 a +x F x = Ma x F y = Ma y F T - f k1 - f k2 = Ma F N2 - F N1 - Mg = 0

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FCos - F T - f k1 = ma F N1 + FSin - mg = 0 F T - f k1 - f k2 = Ma F N2 - F N1 - Mg = 0 f k1 = k1 F N1 f k2 = k2 F N2 Block Equations Slab Equations Friction Equations

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What is a force? An interaction between TWO objects. For example, pushes and pulls are forces. We must be careful to think about a force as acting on one.

What is a force? An interaction between TWO objects. For example, pushes and pulls are forces. We must be careful to think about a force as acting on one.

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