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6 January, 05:20

Explain what is mean to say that energy is conserved as a ball falls toward the ground

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Answers (2)
  1. 6 January, 06:34
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    Gravity is causing the movement, no other external energy is needed to cause movement
  2. 6 January, 09:01
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    It means that as the ball falls lower and lower, and loses

    potential energy constantly, all the energy that it loses

    has to go somewhere. None of it can just disappear.

    Part of the potential energy turns to kinetic energy, in the

    downward motion of the ball. The rest of it goes into pushing

    air out of the way, and slightly heating some air as the ball

    scrapes through it. If you had some way of measuring these,

    "conservation of energy" means that the total would never change.

    Energy can never disappear.
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