In the diagram below the mass of the block is 4 kg and the ramp is inclined at an angle of 60 degrees. A) Find the minimum force F that will keep the block from sliding down the ramp if there is no friction between the block and the ramp. B) Find the minimum force F that will keep the block from sliding down the ramp if there is friction between the block and the ramp and the coefficient of static and kinetic friction is 0.8 and 0.5.

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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!