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| Best Seller  | Weight: 100g Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift... more | FREE shipping go to store |
 | Weight: 100g Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift... more | FREE shipping go to store |
| Best Seller  | Weight: 100g Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift... more | FREE shipping go to store |
 | Weight: 100g Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift... more | FREE shipping go to store |
 | Specification: Material: wood plastic and metal Size: 12*5*4cm / 4.7*2.0*1.6in Age: over 4 years old Experimental principle: The electric energy in the battery is converted into the kinetic energy of a motor which drives the robot s two arms to move... more | go to store |
 | Weight: 100g Not only demonstrates a pendulum but also shows the Laws of Conservation of Momentum and Energy. Friction and damping effects are also observed. Often used as a toy to amuse people. Includes steel balls plastic frames and base. Great gift... more | FREE shipping go to store |
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