When do we use Fs=us*N to calculate the static frictional force, as opposed to just equating Fs to the horizontal component of the normal force?
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When direction of motion is parallel to normal surface, Fs=us*N, just before object starts moving from stationary position.
When direction of motion is angular (yet non-perpendicular, in which case Fs=0 as angle=0) to normal surface, Fs=N*sin(angle), assuming object is stationary on an inclined plane.
When direction of motion is angular (yet non-perpendicular, in which case Fs=0 as angle=0) to normal surface, Fs=N*sin(angle), assuming object is stationary on an inclined plane.
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