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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(see related video) 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?
I am not able to see the video but I will try to answer this question regardless.
We are adding another 5 cm to the strap. Adding 25% makes the force 25% more powerful. 3N + .25(3N) = 3.75N
Your reasoning isn't bad, though it would apply to the torque, or rotational effect of the force, rather than just to the force.
answer/question/discussion:
• 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?
If the glue comes loose, the die will move in a straight line away that is a tangent to the circular motion that it was moving in.
answer/question/discussion:
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10 minutes
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It's hard to visualize this without the video. I'll try to fix the posting of the video tomorrow afternoon. Should be no problem. I'll let you know; email me tomorrow night if you haven't heard anything.