Moving and newton's Third Law ```Name: Marcelle Status: student Age: N/A Location: N/A Country: N/A Date: N/A ``` Question: I am having difficulty explaining Newton's Third Law of Motion in regard to every action force has an equal and opposite reaction force. in that case how does anything move? Replies: F net = ma and F1,2 = -F2,1 So let us say mass one is a person and mass two is Earth. To walk, you push against Earth just as hard as Earth pushes on you. so: M earth (a) = -m person (A) Wince these are equal and opposite products, the smaller mass will have the main acceleration. ---Nathan A. Unterman A good conceptual physics source that is easy to read and will help you is: Paul Hewitt "Conceptual Physics" Addison-Wesley Click here to return to the Physics Archives

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