Bridge and Truck (1J40.40)
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A long board with position markings is supported at each end by a kitchen scale. A 10 lb. toy truck is rolled to different positions along the bridge while the forces at each end of the bridge are indicated by the scales. The bridge by itself weighs 8 pounds and the support/pivot points are 60 inches apart. The black lines on the bridge are spaced approximately 6 inches apart.
