A child ties a 0.3 kg stone to one end of a string. Holding the other end, the child whirls the stone in a vertical circle of radius 0.9 m. a. At the top of the circle, the speed of the stone is 8 m/s. What is the tension in the string? Draw the free body diagram. b. At the bottom of the circle, the speed of the stone is 9 m/s. What is the tension in the string? Draw the free body diagram. c. The string can withstand a maximum tension of 40 N before it breaks. The child whirls the stone faster and faster. At what point on the circle does the string break? Show this point on a circle, then draw the trajectory of the stone after breaking. Make sure you clearly show the direction of the stone immediately after the string breaks. d. What is the speed of the stone as the string breaks?

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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!