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Math Help - Forces

  1. #1
    Junior Member cinder's Avatar
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    Forces

    A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 ^\circ, and the man pulls upward with a force \vec{F} whose direction makes an angle of 30.0 ^\circ with the ramp.

    1. How large a force \vec{F} is necessary for the component F_x parallel to the ramp to be 6 0.0 {\rm N}?

    2. How large will the component F_y perpendicular to the ramp then be?

    I've got the answers: 69.3 N and 34.6 N respectively, but I don't know how to actually work the problem and get those answers.

    I think that \vec{F} is the same as \vec{F_x} and \vec{F_y}, but I don't know if that helps me or not.
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  2. #2
    Junior Member Spimon's Avatar
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    I hope this helps a bit
    The angle of the ramp isn't used in this problem because you're already given the force required to move the case up the ramp. That angle would have been used to detemine that force.
    Fx and Fy are not the same as F vector. Fvector is the force the moving guy is exerting on the case, Fx is the component parallel to the ramp and Fy is the component perpendicular to the ramp.
    Let me know if this is unclear in any way.

    Make sure you're VERY familiay SOH-CAH-TOA for these type of questions...

    Last edited by Spimon; October 4th 2007 at 10:51 PM.
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  3. #3
    Junior Member cinder's Avatar
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    Oh! That helps a lot! Especially for the second question.

    It seems I was doing the first question correctly, but I wasn't in "degree" mode, so I was getting a different answer.

    Thanks for taking the time to draw that out, it really helped!
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