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Weightlessness01:01

Weightlessness

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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国際宇宙ステーション:テスト時間

Tony Reichhardt

    Nature
    |August 19, 2005
    PubMed
    まとめ

    No abstract available in PubMed .

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