A $\vec F\,\, = \,\,\hat i\, + \,4\hat j\,$ acts on block shown. The force of friction acting on the block is :
Medium
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As given in fig.
Normal force,
$N=(10-4) \hat{j}=6 \hat{j}$
Maximum frictional force,
$f=\mu N(\hat{-} i)=0.3 \times 10(\hat{-} i)=3(-\hat{i})$
Maximum frictional forceis $f>1 N,$ so that the frictional force act only equal to the force in $(+\hat i) $direction but in opposite direction
$f=1(-\hat{i})$
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