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PHY 241
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.
** CQ_1_20.1_labelMessages **
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.
How much force will that rubber band have to exert?
answer/question/discussion: ->->->->->->->->->->->-> :
15 cm * 3 N = 45 N*cm
45 N*cm = 5 cm * F
F = 9 N perpendicular to
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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: ->->->->->->->->->->->-> :
If the forces were constant, equal and located at equal distance from the center, the strap would accelerate in the direction of the net force. However, seeing that
there are varying forces located at different distances from the center which would begin to decrease once teh strap was set free, some of the net force (decreasing
from 12 N at the instant the die separates from the table) would cause the strap to rotate
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&#Very good responses. Let me know if you have questions. &#