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Why does gravity give a constant acceleration and centrifuge?

  1. Nov 10, 2009 #1
    Hello everyone,

    Normally if there is 1 kg object and I apply 10 N force it would accelerate at 10m/s. Here the acceleration is determined by the mass of object. How does gravity in the absense of resistance make objects travel at a fixed acceleration?

    In a centrifuge a force equivalent to double or triple gravity is used. Does this force give a constant acceleration (9.8m/s2) like gravity too. How is that done?

    Thanks!!
     
  2. jcsd
  3. Nov 11, 2009 #2

    A.T.

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    Acceleration is constant if the force is constant, which is not really the case for gravity, but rather an approximation for small fall distances.
    No, the centrifugal acceleration depends on the distance from the rotation center.
     
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