A 60 kg student rides on a roller coaster that makes a vertical loop. a. Draw a free-body diagram for when the student is at the bottom of the loop. B.if the radius of the loop is 30m,and the roller coaster is traveling at 20 m/s at the bottom of the loop,what is the net force acting on the student in the vertical direction? C.What force does the seat apply to the student when at the bottom of the loop?

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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!