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Negative inertia

  1. Dec 4, 2005 #1
    An object with positive inertia resists acceleration. An inertialess object would not resist acceleration at all. What would an negative inertia object be like?
  2. jcsd
  3. Dec 4, 2005 #2


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    That's when you throw a ball forward, but it ends up smacking you in the face.
  4. Dec 4, 2005 #3
    I would not word it such since the concept of force is too slippery for the intuition. For example, how much force does it take to accelerate light? :)

    But yeah, like Galileo said, an object with negative inertia also resists a change in its motion, simply in the opposite direction. Thus we find the amusing conclusion that placing a body with negative inertia in a (positive) gravitational field causes it to fall since the field pushes it away, causing it to come closer.
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