A box of mass 5.9 kg is sliding down a ramp, as shown in the picture. The coefficient of kinetic friction between the ramp and the box is 0.4, while the angle of the ramp with the ground is 30°.     What is the size of the friction force?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!