Class 11 Physics Laws of Motion Galileos Law of Inertia

Galileo’s Law of Inertia

  • Aristotle’s Law was falsified by Galileo. Galileo corrected Aristotle’s law saying “An external force is required to keep a body in motion, only if resistive forces are present”


  • According to this law, A body moving on a frictionless surface should move with constant velocity.
  • A body at rest is considered equivalent to a body in uniform motion (In both cases, acceleration = 0; net force = 0)
  • Galileo’s law is the basis of Newton’s 1st Law of motion

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