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Homework Help: Shouldn't force pairs equal in magnitude cancel each other?

  1. Oct 19, 2016 #1
    1. The problem statement, all variables and given/known data
    If every action has an equivalent and opposite reaction, how is that anything ever happens ?. Shouldn't force pairs equal in magnitude cancel each other?
    2. Relevant equations

    3. The attempt at a solution
    I tried drawing a free body diagram, but it didn't help much. This is a conceptual problem for me
  2. jcsd
  3. Oct 19, 2016 #2
    Could you state Newton's Third Law?
  4. Oct 19, 2016 #3
    Every action has an equal and opposite reaction.
  5. Oct 19, 2016 #4
  6. Oct 19, 2016 #5


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    Two forces can cancel each other only if they are acting on the same body. Is that the case with Newton's 3rd law?
  7. Oct 19, 2016 #6


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    On what object (or objects) are those two forces acting on?
  8. Oct 19, 2016 #7
    Have you drawn a free body diagram for each body separately, showing only the forces acting on each body separately?
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