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11. Newton's First Law of Motion describes what phenomenon?

Steve Helber/AP
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Inertia: An object not subject to any net external force moves at a constant velocity

 

Gravitation: Physical bodies attract each other with a force proportional to their mass

 

Acceleration: The rate of change of a body over time is proportional to the net force acting on it

 

Kinetic energy: The energy of a body is equal to one half of the product of its mass times and velocity squared

 
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