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    The answer is B but I don't know why, why can't the other diagrams be correct as well?
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    (Original post by p29)
    The answer is B but I don't know why, why can't the other diagrams be correct as well?
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    (Original post by p29)
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    The normal contact force is always perpendicular to and away from the surface. Also for vectors in equilibrium, the sum of the force vectors is equal to 0. So the arrows in the triangle have to be end to end which rules out diagram A for example.
 
 
 
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