Help with physics homework

Posted on 2013-11-28 15:52:00 in Physics by SOMEONE

A force of 80. newtons is applied to a rope to pull a sled across a horizontal surface at constant velocity. The rope is an at angle of 40. degrees above the horizontal. Calculate the magnitude of the component of the 80.-newton force that is parallel to the horizontal surface. Determine the magnitude of the frictional force acting on the sled.



I know friction force is 80.N after some calculations. But how the heck do you get Parallel Force through this? I was thinking it's also equal to 80.N, but following standards, I don't know how I'm supposed to get Fg for Parallel Force=Fg(sin[feta]).



Any help? Thanks for tips and answers :)

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