This pair of identical wooden trolleys 300mm long mounted on three wheels with ball bearings and a spring loaded plunger is fitted to give impulse when released. Another trolley mounted on four wheels with ball bearings to give friction-less experiments. Supplied complete with 3 elastic rings, 3 springs, 4 pins (for stacking), 2 rubber corks. Supplied with 2 Masses and 2 Height Adjustable Pulleys.
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