resultant of forces acting on an inclined plane

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ccullen768

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stuck on question 2, the answers are 7.53N at 7.7' inclined plane. i know what to do when the force going up the plane is given (question 1) but i can't seem to apply that to when i'm given the force of the going down (question 2)
 

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ccullen768 said:
stuck on question 2, the answers are 7.53N at 7.7' inclined plane. i know what to do when the force going up the plane is given (question 1) but i can't seem to apply that to when i'm given the force of the going down (question 2)

the second picture is my working out. i've clearly went wrong somewhere and can't seem to find it. all help is appreciated. i
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In your work - ALWAYS include arrows (with head) to indicate direction of the force (otherwise the FBD does not make sense.).

Are you trying to solve these by graphical method (force polygon)? If you are using polygon method, then draw a fresh polygon indicating magnitude (length of sides) and directions (angle and arrowhead).Remember for force polygon, head of one vector must touch the tail of the other vector.
 
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