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Air resistance on bodies in free fall

  1. Aug 23, 2012 #1

    In a demonstration that was shown in class, two paper cups were dropped from different heights. The first was dropped from two meters and the other was dropped from one meter. Both landed on the ground at the same time.

    Why is this so? Would it be reasonable to say that if I dropped one minibus from one thousand meters and the other from five hundred meters, both would hit the ground at the same time?

  2. jcsd
  3. Aug 24, 2012 #2


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    Staff: Mentor

    If they were released simultaneously, and the only difference was their release height, then for what you say to be true the one released at 2m must have been forcibly thrown downwards.
    For identical minibuses—only if there was some sort of a 'chute attached to the lower one. :smile:
  4. Aug 24, 2012 #3
    If you teacher did the demonstration are you sure the demo was not rigged?
    Perhaps ther was a lump of iron in th e higher cup?
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