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    Ok, I understand how to calculate all of the angles and forces quite well, I could easily pass that. What I don't quite understand is how to figure out the angles on an inclined plane after drawing the model. I draw the model as a sketch to help and add on all the necessary forces but after that o can't figure out the correct angles to use. Any help would be very much appreciated because I'm teaching myself this and don't have anyone else to ask. Thanks
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    I'm not quite sure what you're asking. What angles are you having difficulty finding?
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    usually true,

    parallel to slope mainly sin (theta)
    perpendicular to slope cos (theta)

    I would still recommend drawing the triangles on the diagram
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    Draw the triangles is always the best way.

    One method I picked up is whether or not you want the majority of the force - in a hypothetical example, where the angle of the plane, \theta < 45 /degree , to the horizontal the weight of an object is mostly acting into the slope, perpendicular to it. As, when theta is less than 45 degrees,  cos \theta > sin \theta , we want the larger and thus the cosine of the angle, so the component of the weight perpendicular to the slope is mg cos \theta .

    That probably wasn't very clear, but I hope you get my drift.
 
 
 
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Updated: March 20, 2011
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