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Dynamics wagon problem

  1. Nov 3, 2014 #1
    • Member warned about not including efforts
    1. The problem statement, all variables and given/known data
    A child is pulling a wagon of mass 7.38 kg up a hill inclined at an angle of 14.3° to the horizontal. The child applies a force parallel to the hill. The acceleration of the wagon is 6.45 cm/s2 up the hill. Friction is negligible. Determine the magnitude of (a) the force applied by the child, and (b) the normal force on the wagon.

    2. Relevant equations
    F=ma

    3. The attempt at a solution
     
    Last edited: Nov 3, 2014
  2. jcsd
  3. Nov 3, 2014 #2

    RUber

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    You might need some directional components for this one. Try drawing a diagram.
     
  4. Nov 3, 2014 #3

    OldEngr63

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    We need to have an FBD for the wagon.
     
  5. Nov 3, 2014 #4
    Is there any other way this problem can be solved?
     
  6. Nov 3, 2014 #5

    OldEngr63

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    Oh, I suppose you could just guess.
     
  7. Nov 3, 2014 #6
    ok
     
    Last edited: Nov 3, 2014
  8. Nov 3, 2014 #7

    td21

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    a) F = ma, what's F in this case?
    b) N = mgcosθ
     
  9. Nov 3, 2014 #8
    thank you for your help td21 :)
     
  10. Nov 3, 2014 #9
    I understand b) now thanks :D but a) I am still having trouble understand how it is solved
     
  11. Nov 3, 2014 #10

    haruspex

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    1. List all the forces acting on the wagon.
    2. For each force, determine the component of it parallel to the slope.
    3. Write an equation corresponding to ##\Sigma F = ma## for the forces and acceleration parallel to the slope.
     
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