1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    oic...

    thanks for your ans
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook