# 100927 - Physics 121 9/27/10 9/27/10 Physics 121 1 9/27/10...

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Physics 121 9/27/10 Prof. E. F. Redish 1 9/27/10 1 Physics 121 9/27/10 2 Physics 121 9/24/10 3 Physics 121 ± ± a F m net = AB BA FF ±± = ² “Net pForce “ = vector sum of all the pForces acting on the object.

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Physics 121 9/27/10 Prof. E. F. Redish 2 9/27/10 4 Physics 121 force) feeling (object force) causing object ( ± F ± 9/27/10 6 Physics 121 9/27/10 7 Physics 121
Physics 121 9/27/10 Prof. E. F. Redish 3 9/27/10 8 Physics 121 m W a ± ± = 9/27/10 11 Physics 121 g m W a ± ± ± = = g m W ± ± = 9/27/10 12 Physics 121

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Physics 121 9/27/10 Prof. E. F. Redish 4 9/27/10 Physics 121 ± W E ± m = m ± g ± g g ± 9.8 N/kg What object causes W ? Why N/kg instead of m/s 2 ? ± ± a F m net = AB BA FF ±± = ² A pForce is what two objects do to
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## This note was uploaded on 12/28/2011 for the course PHYSICS 121 taught by Professor Shawhan during the Spring '10 term at Maryland.

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100927 - Physics 121 9/27/10 9/27/10 Physics 121 1 9/27/10...

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