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The first activity describes an experiment which shows that most
objects move to the ground at the same speed when dropped from the same heights.
The second and third activities both show the concept
of the weightlessness of a falling object. Objects
falling toward the earth are said to be free – falling if the only thing pulling or pushing on them is gravity. The
force of attraction between two objects is called a g-force. All falling objects experience a feeling of zero gravity.
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