How Does Inertia Affect Earth's Rotation in Circular Motion?

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Discussion Overview

The discussion revolves around the effects of inertia on Earth's rotation and the forces involved in maintaining circular motion. Participants explore concepts related to angular momentum, centripetal force, and the nature of forces acting on Earth and its particles in circular motion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about the role of inertia in maintaining circular motion.
  • One participant suggests that angular momentum might be relevant to the discussion.
  • Another participant asserts that a net centripetal force is necessary for an object to move in a circular orbit.
  • It is stated that a body can only be in circular motion if a net force acts on it, and that force is continually required to maintain that motion.
  • One participant claims that Earth continues to rotate without an external force due to the circular motion of its constituent particles, which interact with each other.
  • Questions are raised about what force causes Earth's rotation and the nature of the motion of its particles.
  • A later reply emphasizes that Earth's rotation is a result of the combined circular motion of its particles, which derive their forces from interactions with one another.

Areas of Agreement / Disagreement

Participants express differing views on whether an external force is necessary for Earth's rotation and the nature of forces acting on particles in circular motion. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Some statements depend on interpretations of force and motion, and there are unresolved questions regarding the specific forces involved in Earth's rotation and the behavior of its particles.

darknum
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is there a way to keep inertia in circular motin?
 
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Are you thinking of angular momentum?
 
You will always need a net centripetal force (acting radially inwards) on an object to have it moving in a circular orbit, if that was what you were after.
(Your question was rather unclear..)
 
A body in circular motion will remain in circular motion if no unbalanced forces act on it. Is it the truth of this statement that you are trying to ask about?

If yes, then the answer is NO. First of all, a body can be in circular motion only if a net force acts on it. And to continue with that circular motion, a force is continually required.

Another interesting point is that the Earth continues rotating even when no force ( to cause rotation ) acts on it. This is because Earth is an ensemble of particles and those particles are in continuous circular motion due to forces by other particles. If you take them as a whole, which is the earth, then it needs an external force to keep it moving in a circle.

spacetime
www.geocities.com/physics_all/index.html
 
spacetime said:
A body in circular motion will remain in circular motion if no unbalanced forces act on it. Is it the truth of this statement that you are trying to ask about?

If yes, then the answer is NO. First of all, a body can be in circular motion only if a net force acts on it. And to continue with that circular motion, a force is continually required.

Another interesting point is that the Earth continues rotating even when no force ( to cause rotation ) acts on it. This is because Earth is an ensemble of particles and those particles are in continuous circular motion due to forces by other particles. If you take them as a whole, which is the earth, then it needs an external force to keep it moving in a circle.

spacetime
www.geocities.com/physics_all/index.html

DEAR SPACETIME,

WHAT FORCE CAUSES THE EARTH TO CONTINUE ROTATION THEN ?

AND HOW DO YOU KNOW THAT THE CONSTITUENT PARTICLES ARE IN CIRCULAR MOTION ?


<> ROGER <>
 
Earth's rotation

Earth's rotation doesn't require an external force. It is the circular motion of the constituent particles that does. Earth's rotation is a result of all those motions combined.

And where do those particles get the force from? They get it from each other. We are considering only the circular motion of the particles.


spacetime
www.geocities.com/physics_all
 

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