1. You overhear one of your fellow students in this course say: “If you are whir

Question

1. You overhear one of your fellow students in this course say:
“If you are whirling a ball around in a circle on the end of a string and the string breaks then the
ball is thrown away from the center of the circle by a centrifugal force.”
(a) Is the ball “thrown away from the center of the circle”? Explain.
(b) The same student then says:
“While you are whirling the ball around, the string is held tight because of the outward
centrifugal force on the ball.”
How would you explain to this student why the string is under tension?

please support the with free body diagram if it is possible.

Explanation / Answer

(a) no the ball is thrown in the direction tangent to the circle. i.e. in the direction of the velocity http://images.wikia.com/schools/images/a/a8/A4centfc.jpg (b) The string is held tight because of the balancing forces between the centrifugal force and the centripetal force. so the tension is caused by the outward force of the ball (centrifugal)

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