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Crossing the River
Description: Demonstrate superposition of 2-D velocities by pulling on the sheet below the moving tractor.
Instructions: Place tractor at an angle at one edge of the piece of paper or sheet. Turn tractor on and pull sheet of paper at a constant speed to simulate a running "river". With good coordination and timing the truck should wind up on the other side of the "river" at the same (relative) place it left.
Parts: One battery operated truck
A big piece of poster paper or a fabric sheet
A reflection mirror for larger rooms.
Setup Time: 5 min
Quant. in Demo Room: 1
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