AQA M1 Jan 2013 Q3

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AQA Mechanics 1B January 2013 paper.
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Doesn't matter where you draw it from as the box is just being treated as a particle. It has no size so in a sense, the top is the bottom... The direction is important though (it needs to be perpendicular to the plane)

mathedup
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nice, but reaction force is the support force of the surface subject is on, there fore the arrow goes from the bottom of the box, where it contacts with a surface, with simply causes reaction force, but not from the top of the box:D


nevmoveik
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Great teaching keep it up Sir Allah will gives you the rewords for it. Can you please do the AQA M1 & C2 summer 2013. 

bahrullah