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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Mechanics 1B AS Angles watch
- Thread Starter
- 19-03-2011 13:01
- 19-03-2011 13:03
I'm not quite sure what you're asking. What angles are you having difficulty finding?
- 20-03-2011 00:16
parallel to slope mainly sin (theta)
perpendicular to slope cos (theta)
I would still recommend drawing the triangles on the diagram
- 20-03-2011 09:07
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, , 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, , we want the larger and thus the cosine of the angle, so the component of the weight perpendicular to the slope is .
That probably wasn't very clear, but I hope you get my drift.