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A block of mass \( m \) is lying on an inclined plane. The coefficient of friction between the plane and the block is \( \mu \). The force \( \left(\mathrm{F}_{1}\right) \) required to move the block up the inclined plane will be:-
- (1) \( m g \sin \theta+\mu m g \cos \theta \)
(2) \( m g \cos \theta-\mu m g \sin \theta \)
(3) \( m g \sin \theta-\mu m g \cos \theta \)
(4) \( m g \cos \theta+\mu m g \sin \theta \)
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