In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will

Increase

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decrease

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Remain the same

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may increase or decrease

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Solution

The correct option is B
decrease

Now if the angle made by $F_{c}$ and the vertical decreases then frictional force is decreased

As you can see the horizontal component decreases

Which in this case turns out to be frictional force.

Yes the magnitude of frictional force depends upon the angle made by Contact force and the vertical/Horizontal

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Q. In a situation, the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will

Q. In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude if the angle between this force and the vertical is decreased the frictional force between the surface and the body will?

Q. In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will
(a) increase
(b) decrease
(c) remain the same
(d) may increase or decrease.

A body of mass 400g slides on a rough horizontal surface. If the frictional force is 3.0 N, find (a) the angle made by the contact force on the body with the vertical and (b) the magnitude of the contact force. Take g = 10 $\frac{m}{s^{2}}$

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