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in case of static friction...when some force is applied...how is the horizontal componet of the contact force i.e. static friction (fs) directly propotional to its vertical component i.e.  (normal force)? this is only possible when the contact force vector is inclined at an angle of 450 to both the axes.....in some books like H.C. Verma....its given that since f  ..(friction proptional to normal force), f= s ??
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Moderation Team
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