Abody is placed on a rough inclined plane of inclination $\theta$ .As the angle $\theta$ is increased from $0^o$ to $90^o$ the contact force between the block and the plane
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contact force, $f=\mu N=\mu m g \cos \theta$
When $\theta=0, f=\mu m g$
If $\theta$ increases $\cos \theta$ will decrease. So $f$ will decrease with increasing $\theta$
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