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Unformatted text preview: dt = r 1 p 1 + r 2 p 2 = r 1 F ( e ) 1 + r 2 F ( e ) 2 + r 1 F 21 + r 2 F 12 . (7) Since Eq.(2) is satis f ed, it follows that r 1 F 21 + r 2 F 12 = , (8) which can be rewritten as ( r 1 r 2 ) F 21 = , (9) with the help of Eq.(6). Equation (9) implies that F 21 lies strictly in the direction of the vector ( r 1 r 2 ) , which is the strong law of action and reaction. 1...
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 Fall '10
 Wilemski
 mechanics

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