Is the earth in a non-inertial reference frame?

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SUMMARY

The Earth is classified as a non-inertial reference frame due to its rotation around its own axis, which introduces centripetal acceleration. According to Newton's model, gravity acts as a real force causing proper acceleration, rendering orbiting bodies non-inertial. In contrast, general relativity posits that free-falling objects are inertial, but inertial frames are only locally valid at the planet's center, making the Earth's surface distinctly non-inertial.

PREREQUISITES
  • Understanding of Newtonian gravity and its implications on motion
  • Familiarity with general relativity and its concepts of inertial frames
  • Knowledge of centripetal acceleration and its effects on rotating bodies
  • Basic principles of reference frames in physics
NEXT STEPS
  • Explore the implications of Newton's laws on non-inertial frames
  • Study the concept of inertial frames in general relativity
  • Investigate the effects of centripetal acceleration on objects in motion
  • Examine the differences between inertial and non-inertial reference frames in various physical contexts
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Physics students, educators, and anyone interested in the dynamics of motion and reference frames, particularly in the context of gravitational theories.

deadscientist
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So I would agree that it has a uniform tangential velocity but would the centripetal acceleration of the Earth put it in a non inertial frame.
 
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The rest frame of the Earth is noninertial due to rotaion around its own axis. As for the centripetal accelleration due to suns gravity, it depends which theory of gravity you use:

In Newtons model gravity is a real force that causes proper acceleration, which makes orbiting bodies noninertial (even nonrotationg ones).

In general relativity free falling objects are inertial, but inertial frames exist only locally, at the center of the planet. The surface is very noninertial.
 

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