1030 Notes - We have dened a force FAB as the action by...

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10/30/09 Oregon State University PH 201, Lecture #15 1 We have de fi ned a force, F AB , as the action by object A on object B, over some time interval, ± t , that effects a change in B’s momentum, ± P B . In other words: F AB ± t = ± P B And, because momentum is conserved in this universe , there is a corresponding (re)action by B on A (over the same time interval, ± t ) that effects a change in A’s momentum: F BA ± t = ± P A The inescapable conclusion: Anytime there is a force, there are actually two forces—a matched pair: F AB = – F BA This is Newton’s Third Law .
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10/30/09 Oregon State University PH 201, Lecture #15 2 Having observed this “double-ended” nature of any force, Isaac Newton then began to examine how a force—or any vector combination of forces, F net —affects the motion of any mass. We can describe that effect in terms of its momentum ( F net ± t = ± P ), but how to restate it more simply—more usefully?
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