# Lecture6 - Newton 1 st Law If the net force acting on a body is zero then if the body is initially at rest it will remain at rest if it is

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Unformatted text preview: Newton 1 st Law If the net force acting on a body is zero, then if the body is initially at rest it will remain at rest. if it is initially moving it will continue doing so. Newton 2 nd Law F i = ma i =1 i =n F Tot = Newton 3 rd Law If an object A exerts a force F on another object B, then B exerts a force F on A. F AB = - F BA 3 rd law Force ALWAYS occur in equal but opposite pairs between two objects (action-reaction). F BA F AB m A m B •Why they don’t just cancel out? F BA F AB Force diagram They ALWAYS act on different bodies = M a Newton 3 th Law IMPORTANT The two forces acts on different objects !!! F TOT = F table + F hand WRONG! Which M?? F table hand F hand table F table hand F hand table Free body diagram F Tot table = M table a table F Tot hand = m hand a hand Action – reaction From 3 rd law: F hand -> table = - F table-> hand F hand->table = M table a table F table ->hand = m hand a hand From coordinate: Newton 1 st Law If the net force acting on a body is zero, then if...
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## This note was uploaded on 04/03/2008 for the course PHYSICS 7A taught by Professor Lanzara during the Spring '08 term at University of California, Berkeley.

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Lecture6 - Newton 1 st Law If the net force acting on a body is zero then if the body is initially at rest it will remain at rest if it is

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