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Subtraction ad resultant

  1. Feb 8, 2014 #1
    There are forces -4 and -8 Newton.
    If we need to find the resultant of the force we do : (-4) + (-8) = -12 N
    If we need to find the difference in force we do : (-4) - (-8) = +4N

    Are the two methods correct?
     
  2. jcsd
  3. Feb 8, 2014 #2

    adjacent

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    Yes,the tow methods are correct.
     
  4. Feb 8, 2014 #3

    sophiecentaur

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    Yes
    The resultant force has a physical meaning that is easy to grasp but what do you think the 'difference' represents? It's worth while exploring around things like this if you want to improve your understanding.
     
  5. Feb 9, 2014 #4
    Is the difference in force : (-4) - (-8) or (+8) - (+4)?
     
  6. Feb 9, 2014 #5

    Doc Al

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    Those expression are equivalent.

    A + (-B) = A - B

    -A - (-B) = -A + B = B - A, etc.
     
  7. Feb 9, 2014 #6

    adjacent

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    Miraj Kayastha,
    What do you understand by the term Difference of forces?
     
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