A person pulls a block by applying a force \( F \) and the block re...

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A person pulls a block by applying a force \( F \) and the block remains at rest. The arrows in the
P diagram correctly show the directions, but not

W necessarily the magnitudes, of the various forces on the block. Which of the following relations among the force magnitudes \( \mathrm{F}, \mathrm{W}, \mathrm{N} \), and \( \mathrm{f} \) must be true? Here \( \mathrm{f} \) is friction and \( \mathrm{W} \) is the weight (the force of gravity), and \( \mathrm{N} \) is the normal reaction.
(1) \( \mathrm{F}=\mathrm{f} \) and \( \mathrm{N}=\mathrm{W} \)
(2) \( \mathrm{F}=\mathrm{f} \) and \( \mathrm{N}\mathrm{W} \)
(3) \( \mathrm{F}\mathrm{f} \) and \( \mathrm{N}\mathrm{W} \)
(4) F \( \) f and \( N=W \)
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