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Introductory Physics Homework Help
Why Does Cos(30) Calculate the Correct Frictional Force on a Sliding Crate?
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[QUOTE="jfk313, post: 4531184, member: 490517"] [h2]Homework Statement [/h2] Find the frictional force (magnitude and direction) on the crate if the crate is sliding up the ramp. Frictional force= ? μk = 0.30 μs = 0.74 mass=10.0 kg angle of incline 30° to the horizontal [h2]Homework Equations[/h2] fk=uk * N [h2]The Attempt at a Solution[/h2] I tried doing this problem by drawing t he free body diagram and creating another triangle to find frictional force, as seen in the picture[SPOILER][SPOILER][SPOILER][SPOILER]https://www.youtube.com/watch?v=https://www.youtube.com/watch?v= [/SPOILER][/SPOILER][/SPOILER][/SPOILER]. i tried solving for the frictional force by multiplying the kinetic coefficient of friction, gravity and mass with sin(30)... I found out from a friend that cos(30) would give you the correct answer, but I not sure why. So I wanted to understand why the sin(30), giving you the parallel force of friction, is not correct when trying to solve this problem. [/QUOTE]
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Why Does Cos(30) Calculate the Correct Frictional Force on a Sliding Crate?
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