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Force Relative to the vertical?

  1. Oct 13, 2015 #1
    Can you explain why cosine theta is vertical, and sin theta is horizontal on this example? I am confused.
     
  2. jcsd
  3. Oct 13, 2015 #2

    berkeman

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    Staff: Mentor

  4. Oct 13, 2015 #3
    Thanks. I attached a photo, but it's not showing up. Your example is what we're covering next, I haven't gotten there yet. image.jpeg image.jpeg
     
  5. Oct 13, 2015 #4

    berkeman

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    Staff: Mentor

    It's because of which angle theta they are using (they show theta between the force vector and the vertical axis). If they defined/chose theta to be between the force vector and the horizontal axis, that would switch the sin() and cos() terms, right?
     
  6. Oct 13, 2015 #5
    Thanks man, it makes a little more sense. I haven't taken trig in a few years.
     
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