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Homework Help: How to proof F = mg sin. θ

  1. Jan 10, 2010 #1
    i can't understand the formula

    F = mg sin. θ

    on a smooth plane

    how to proof a = g sin. θ

    sin. θ...

    http://img213.imageshack.us/img213/2313/44877072.jpg [Broken]
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jan 10, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Do you understand how to find the components of a vector using trig functions of a right triangle?

    You might want to read this: http://www.physicsclassroom.com/Class/vectors/u3l3e.cfm" [Broken]

    Ask yourself:
    What forces act on the object? What are their components parallel and perpendicular to the incline? What's the net force on the object? Then apply Newton's 2nd law.
    Last edited by a moderator: May 4, 2017
  4. Jan 10, 2010 #3

    thanks for your ans
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