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Work Done question

  1. Jun 6, 2014 #1
    1. The problem statement, all variables and given/known data

    If someone is pushing an object up a ramp 2.6m long and 1.1m at the far end how do I calculate total work done?

    I know the force needed to push the object is 220N.




    2. Relevant equations


    Work Done = Force x Distance

    3. The attempt at a solution

    Do I do 2.6 x 220 and add this to 1.1 x 220?

    Therefore getting 814J?

    Thanks
     
    Last edited by a moderator: Jun 6, 2014
  2. jcsd
  3. Jun 6, 2014 #2

    jtbell

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    Staff: Mentor

    In what direction is the person pushing? Horizontally? Or parallel to the surface of the ramp, i.e. upwards at some angle? Or in some other direction?

    Do you know how to calculate work when the force is not in the same direction as the motion?
     
  4. Jun 6, 2014 #3
    The person is pushing the object up the ramp at an unknown angle.

    Presumably I would use Work Done = Force x Distance but do I just use the length of the ramp or do I need to take the height into consideration?

    Thanks for the reply
     
  5. Jun 6, 2014 #4

    ehild

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    Homework Helper
    Gold Member

    The force needed to push the object is 220 N. That is the minimal force which makes the object moving up the ramp. So it is also directed along the slope.



    ehild
     
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