验证质量守恒定律改进实验
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Description
A two-ball Newton's cradle that splits into separate pieces for easy printing: base, four posts, two top rails, two axles and two swinging ball pendulums. Both balls hang at rest, touching at the centre. The pendulum hubs ride freely on loose 3 mm axles.
Remix hooks
- Pendulum length: 70 mm arm, 10 mm radius balls. Longer arms give a slower swing.
- Joint clearance: pegs are 5.6 mm / 4 mm in 6.4 mm / 4.4 mm pockets. Tighten or loosen for your printer.
- Axle fit: 3 mm axle in a 3.8 mm hub bore and 3.4 mm rail holes.
- Frame height: the pivot sits 110 mm above the base on a 140 x 50 mm plate.
- Pairs with: a printed or drawn angle scale or height ruler placed beside the frame, for mass and height experiments.
- Variants: add more pendulums by adding axle positions along the rails.
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