Science is often tedious and predictable. In science we only change a single variable at a time to experiment. In science, the results should be repeatable. These concepts always seem to be in the background of our Motion & Design lessons as students test the amount of force necessary to move vehicles. The only variable to change in this experiment was to be the amount of weight added to the vehicle. Students did five runs with two blocks of wood, five with one block, and five with no blocks - not changing the amount of force applied by our drop-weight system - and observed the changes in their recorded results.
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