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Description:
As the pendulum swings, the ball will move back and forth under theforce of magnet and finally will stop at some place.Features:
1) Secured in its metal or plastic stand,the all metal pendulum converts kinetic energy into
potential energy
2) the ball moves by the graviation force of themagnet. When energy finishes, i will stop at some placecasually.
3) a good decison maker
