一个小动作，让硬币稳稳待在纸币边缘 Coin Acrobatics Science Experiment For School | Magic science

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一个小动作，让硬币稳稳待在纸币边缘 Coin Acrobatics Science Experiment For School | Magic science
魔力科学小实验第【29】期：硬币耍杂技
Magic Science Episode 29: Coin Acrobatics Science Experiment
【实验材料 Materials】
纸币 cash、硬币 coin
【实验步骤 Steps】
1、纸币竖直，将硬币轻轻放在纸币边缘
2、将对折后的纸币张开成90度开角，再将硬币放在纸币边缘，慢慢拉开纸币使其成一条直线
【实验现象 Phenomena】
当我们直接将硬币放在纸币边缘，硬币立马就掉落下来。当我们把纸币对折并且逐渐拉开，硬币却稳稳地立在纸币边缘。
【实验原理 Principles】
纸币逐渐被拉开的过程中，会和硬币之间产生摩擦，硬币的重心随之移动，以保持平衡。当纸币被拉成直线时，硬币的重心也刚好落在这条直线上，自然不会掉落。
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About this video:
science experiment
Coin Acrobatics Science Experiment
center of gravity
physics
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