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Inertia 1
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Inertia 1

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  • 1. What is inertia?
    • By definition, inertia is the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line.
  • 2. MORE
      • The bigger the mass, the larger the inertia and the harder it is to initiate the movement of the object (there is a direct relationship).
      • The smaller the mass, the smaller the inertia and the easier it is to initiate the movement of the object.
      • The mass of an object is a quantitative measure.
  • 3. Some examples of inertia:
    • An elephant at rest has more inertia than a mouse that is in motion
    • A 500 pound man has more inertia when he is sitting down than a small child has when she is running
  • 4. The First Law of Motion (or Law of Inertia)
    • An object at rest will remain at rest and an object in motion will remain in motion UNLESS acted upon by an unbalanced force.
    • OR if Fnet=0, then a=0 and v=constant
  • 5. Some examples of the First Law of Motion
    • A cart holding a physics student is pushed at a constant speed
    • A ball does not and will not move, until a girl picks it up and throws it
  • 6. Net Force
    • If the net force acting on the object is zero, the object will continue moving in a straight line
      • Ex: If an airplane is moving at constant speed , then the net force equals to zero.

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