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Homework Help: Forces & Magnitude help?

  1. Feb 9, 2009 #1
    A block of mass 2.50 kg is pushed 2.18 m along a frictionless horizontal table by a constant 17.0 N force directed 22.6o below the horizontal.

    Determine the magnitude of the normal force exerted by the table.
    Determine the net force on the block.

    I already found that the work done by the applied force is 3.42×101 J and the magnitude of the force of gravity is 24.50 N. I just don't know what to do to find the other two, I have tried several different equations but none of them are seeming to work for me.....
  2. jcsd
  3. Feb 9, 2009 #2
    Have you set up a FBD? If you do, you'll see that there's three forces that at least partly act in the y-direction. There's no movement in the y-direction, which tells you what about the forces?
  4. Feb 9, 2009 #3


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    Homework Helper

    You need to resolve the Force applied into normal and parallel to the surface components.

    That's where the 22.6° angle comes in.
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