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Homework Help: Horizontal force on frictionless ramp

  1. Oct 2, 2012 #1
    A 100 N box is being pushed with a horizontal force F at 30 degrees on a frictionless ramp. Determine F and N (normal force). I got about 57.74 and about 115 for the second part (I don't know if it is right)

    Fcos(theta) -mgsin(theta)=0 for part A

    N-Fsin(theta)-mgcos(theta)=0 for part B

    Please let me know what you get.

    Thank you for your help! Any and all answers are much appreciated!

    Attached Files:

  2. jcsd
  3. Oct 2, 2012 #2


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    yep, your answers look good to me :)
  4. Oct 3, 2012 #3
  5. Oct 3, 2012 #4


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    There is not enough information to answer this question.

    Is the box stationary?

    Is it moving at a constant velocity?

    Is it accelerating? If so, at what rate?
  6. Oct 3, 2012 #5


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    haha, yes, I was going to say that. I assumed that the box was moving at constant speed, and I got the same answer as him, so I guess he just forgot to write that in the first post.
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