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Checking UnderstandingBill tests out a spring and sees that if he attaches it to a wall and pullswith a force of 200 N, the spring stretches <strong>by</strong> 20 cm from its equilibriumposition.Hmm.. 200 N makesit 20 cm longer.Bill and Carlos then have a tug of war with the spring. Each pulls onhis end of the spring with a 200 N force. The center of the spring staysin the same x position. What is the displacement at Bill’s end?A. 5 cm B. 10 cmC. 15 cm D. 20 cmPhysics 1101: Lecture 25, Pg 14
Checking UnderstandingBill tests out a spring and sees that if he attaches it to a wall and pullswith a force of 200 N, the spring stretches <strong>by</strong> 20 cm from its equilibriumposition.Hmm.. 200 N makesit 20 cm longer.Bill and Carlos then have a tug of war with the spring. Each pulls onhis end of the spring with a 200 N force. The center of the spring staysin the same x position. What is the displacement at Bill’s end?Carlos is acting like the wall here, with the spring pulling back on me with 200 N force.So the total displacement is the same, 20 cm.A. 5 cm B. 10 cmC. 15 cm D. 20 cmBut to keep the center of spring in the same xposition, both Carlos and I must havestepped back an equivalent distance whenwe pulled. So to make a total of 20 cm, eachof us stepped back 10 cm.Physics 1101: Lecture 25, Pg 15
Page 5: Checking UnderstandingWhich spring
Page 8: Is the equivalent spring constant i
Page 12 and 13: Spring DemoThe two situations shown
Page 16: Example Problem 8.7The figure shows

Additional Quiz 3 review will be held tonight (Monday) by TA Kelly ...

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