Reaction Pairs - MasteringPhysics: Assignment Print View...

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3/2/08 4:54 PM MasteringPhysics: Assignment Print View Page 1 of 3 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1114149 [ Print View ] PHYS 2211 ABCDE Spring 08 MP28: Action/Reaction Pairs Due at 11:59pm on Tuesday, February 26, 2008 View Grading Details Newton's 3rd Law Discussed Learning Goal: To understand Newton's 3rd law, which states that a physical interaction always generates a pair of forces on the two interacting bodies. In Principia , Newton wrote: To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. (translation by Cajori) The phrase after the colon (often omitted from textbooks) makes it clear that this is a statement about the nature of force. The central idea is that physical interactions (e.g., due to gravity, bodies touching, or electric forces) cause forces to arise between pairs of bodies. Each pairwise interaction produces a pair of opposite forces, one acting on each body. In summary, each physical interaction between two bodies generates a pair of forces. Whatever the physical cause of the interaction, the force on body A from body B is equal in magnitude and opposite in direction to the force on body B from body A. Incidentally, Newton states that the word "action" denotes both (a) the force due to an interaction and (b) the changes in
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This note was uploaded on 05/08/2008 for the course PHYSICS 2211 taught by Professor Uzer during the Spring '08 term at Georgia Institute of Technology.

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Reaction Pairs - MasteringPhysics: Assignment Print View...

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