Phy 201
Your 'cq_1_20.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The problem:
The metal strap used in the Angular Velocity of a Strap experiment is constrained by a vertical push pin to rotate about a hole in a die. The die is glued in place to a massive tabletop. A rubber band is attached to a point 15 cm from the axis and stretched so that it exerts a force of 3 Newtons, directed perpendicular to the rod. If this force is unopposed it will accelerate the system rapidly. You want to attach a second rubber band 5 cm from the axis to prevent the system from rotating.
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How much force will that rubber band have to exert?
answer/question/discussion: Because the second rubber band is closer to the center than the first rubber band, it would appear to me that a greater force would have to be exerted in order to keep the system balanced : 9 N
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Once both of these forces are in place and the system is stationary, what (if anything) will happen if the glue holding the die to the tabletop comes loose?
answer/question/discussion: the whole setup will move towards you with a force equal to that of the system, the metal strap will remain horizontal as it moves towards you.
The metal strap will actually rotate in addition to moving as you describe, but it will take awhile before we develop enough terminology to understand why.
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7 minutes
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&#Good work. Let me know if you have questions. &#