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![[Post New]](/templates/default/images/icon_minipost_new.gif) 7 Jun 2007 17:39:29 IST
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if the frictional force is not self adjusting then things would start moving at their own !!
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The external force is mgsin30. Now, the role of friction is to prevent the slipping of the block. Friction can go upto a value of  mgcos30. Now if mgsin30 is less than this max value, why should friction apply its max strength. It will apply a value equal to mgsin30
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