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Puzzled to the Tenth Degree

  1. Sep 14, 2004 #1
    A 10.0 kg box is placed on top of a 40.0 kg box, which rests on a table.

    Determine the normal force that the table exerts on the 40.0 kg box.
    Is it 10.0*9.8+40.0*9.8?

    Determine the normal force that the 40.0 kg box exerts on the 10 kg box.
    Is it 10*9.8?
  2. jcsd
  3. Sep 14, 2004 #2
    Yes, you're right. The normal force is equal to the force exerted in the direction opposite to the normal force (in this case the box or boxes).
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