PHY 121
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A rubber band begins exerting a tension force when its length is 8 cm. As it is stretched to a length of 10 cm its tension increases with length, more or less steadily, until at the 10 cm length the tension is 3 Newtons.
• Between the 8 cm and 10 cm length, what are the minimum and maximum tensions, and what do you think is the average tension?
8* 3 =24
10*3=30
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• How much work is required to stretch the rubber band from 8 cm to 10 cm?
9*3=27
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• During the stretching process is the tension force in the direction of motion or opposite to the direction of motion?
Opposite of the direction of motion
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• Does the tension force therefore do positive or negative work?
negative
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The rubber band is released and as it contracts back to its 8 cm length it exerts its tension force on a domino of mass .02 kg, which is initially at rest.
• Again assuming that the tension force is conservative, how much work does the tension force do on the domino?
8*.02=.16
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• Assuming this is the only force acting on the domino, what will then be its kinetic energy when the rubber band reaches its 8 cm length?
8*1.6=12.8
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• At this point how fast will the domino be moving?
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15 min
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&#Please compare your solutions with the expanded discussion at the link
Solution
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