A 75kg passenger is riding the cliffhanger barrel ride at the fair.  If the barrel radius is 4m and the coefficient of friction between the rider and the wall is 0.5, what is normal force the rider experiences and the minimum speed the ride can turn so that the rider doesn't slide down the wall? Normal force = _____  N Min speed = _____  m/s  (round to the nearest tenth)

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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!