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Crossing the River
# 1E10.10

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.

Purchased/Built: built

Setup Time: 5 min

Quant. in Demo Room: 1

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 02-08 The bulldozer moves across a sheet moving at half the speed of the bulldozer or at the same speed.
Sutton M-75 A small mechanical toy moves across a rug which is pulled down the lecture table.
Meiners 6-4.10 A wind up toy is placed on a sheet of cardboard that is pulled along the table.
The American Journal of Physics AJP 48(10),887 A long sheet of paper (river) is pulled along the table by winding on a motorized shaft. A motorized boat is set to cross the river. Marking pens trace the paths.

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