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This makes for a fun and unique gift!
Newton’s Cradle Steel Balance Ball for just $4.69 Shipped!
- The set of balance balls is particularly suitable for the place such as office, desk table,computer table etc.
It is a best and useful gift for children to arouse his/her interest in physics.
Not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy.
Friction and damping effects are also observed.
Shipping is free.
