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Hernaner28
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Homework Statement
The surfer (70kg) is standing over a board which has an angle of 10º with the horizontal. A wave acelerates him to the right at 1.0m/s^2. There is a force that prevents the surfer from sliding over the board.
Homework Equations
Calculate that force. What's the origin of this force?
The Attempt at a Solution
What I did was to analize the surfer only and since there's horizontal aceleration to the right then there's a wave force in horizontal direction to the right. So I just analized it in axis x given the faact that at axis y it doesn't move. So the equations:
http://eva.fing.edu.uy/filter/tex/pix.php/fa2415fb159333cacb5c7a42d79502d8.png
http://eva.fing.edu.uy/filter/tex/pix.php/093b650ee4c9116ddcd68135cf37b616.png
Then I calculated the weight at axis x:
http://eva.fing.edu.uy/filter/tex/pix.php/857f0c71f94a74d9cb6e58fc3e611cfe.png
So the friction force has to be the difference among these two and in the direction of the wave force and it would be 50N but the option is not in the moddle multiplechoice I'm doing.
Thanks!