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Work Done by Tension

  • Thread starter cracka97
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  • #1
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Homework Statement


What is the work done per one revolution by tension in a suspended 2m rope with a 150 g tennis ball attached to its end if you swing the rope 2 times a second such that the tennis ball is in a circular trajectory?


2. The attempt at a solution
The work done is the force multiplied the distance. I don't understand how the force of the tension in the rope is traveling a distance which makes me think that the work done is 0.
 

Answers and Replies

  • #2
tiny-tim
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Welcome to PF!

Hi cracka97! Welcome to PF! :wink:
The work done is the force multiplied the distance. I don't understand how the force of the tension in the rope is traveling a distance which makes me think that the work done is 0.
That's right! …

work done = integral of force "dot" displacement …

and, for circular motion, the displacement is always perpendicular to to the tension. :smile:
 

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