Crossing the River
# 1E10.10
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
| 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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