vanstone

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功和能
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能量守恒定律和能源
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验证机械能守恒定律
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机械能守恒定律
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动能和动能定理
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实验探究功与速度变化的关系
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探究弹性势能表达式
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重力势能
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功率
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功
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经典力学的局限性
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万有引力定律复习
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宇宙航行（二）
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宇宙航行（一）
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万有引力理论的成就（三）
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万有引力理论的成就（二）
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万有引力理论的成就（一）
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万有引力定律
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太阳与行星间的引力
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行星的运动
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