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Homework Help: Simply calculating Fn

  1. Apr 26, 2010 #1
    1. The problem statement, all variables and given/known data

    I know how to calculate F_act by adding F_N and F_g as vectors. But I completely forgot how to calculate F_N! We did forces a few months ago and I'm going over past tests. I'm stumped. I feel pretty dumb ATM.

    2. Relevant equations


    3. The attempt at a solution

    I don't know where to go from here. I made you all a diagram:

  2. jcsd
  3. Apr 26, 2010 #2
    There are no other forces in the direction opposite of your normal force vector into the ramp, so the block's weight will be the only thing that contribute to the normal force
  4. Apr 26, 2010 #3
    So the Fn is the opposite of Fg, so 9.8 x 10 = 980 N?
  5. Apr 26, 2010 #4
    no, Fn is not the "opposite" of Fg
    Fg is pointing down, while Fn is on a diagonal
  6. Apr 26, 2010 #5
    Okay so how do you calculate Fn?
  7. Apr 26, 2010 #6
    big hint: vector components..
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