A very light, 7.5 cm diameter, 90 g acrylic puck for demonstrating collisions between very unequal masses. A steel puck is scarcely deflected after a collision with the acrylic puck.
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A 7.5 cm diameter, 210 g aluminum puck for demonstrating collisions between unequal masses. The aluminum puck deflects a steel puck less than a steel puck but more than the acrylic puck.
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