Understanding Centripetal and Centrifugal Force on a Rotating Platform

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Homework Help Overview

The discussion revolves around the effects of centripetal and centrifugal forces experienced by a person on a rotating platform while holding a spinning wheel. The original poster questions why they spin clockwise faster when tilting the wheel in a specific orientation, despite the Earth's counterclockwise rotation in the Northern Hemisphere.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the relationship between the direction of the spinning wheel and the resulting spin of the platform. Questions arise regarding the influence of the Earth's rotation, the nature of torque, and the significance of measurement uncertainties.

Discussion Status

The discussion is active, with participants providing various perspectives on the role of the Earth's rotation and questioning the assumptions made by the original poster. Some suggest that the Earth's rotation may be negligible in this context, while others seek clarification on the setup and forces involved.

Contextual Notes

There are indications of potential measurement uncertainties affecting the observations, and participants are considering the physical setup of the rotating platform and the spinning wheel.

Dianne Werner
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Homework Statement


If you are in the Northern Hemisphere and you stand on a rotating platform holding a spinning wheel and you tilt the axis so that your left hand is up and the right hand is down, why do you spin clockwise faster than the opposite way?(Right hand up?) It seems like since in the Northern Hemisphere the Earth spins counter clockwise, that the opposite would be true? Which way would the Torque push hardest? My experiment shows clockwise and I need to know why?

Homework Equations

The Attempt at a Solution

 
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Do you think that you would spin faster clockwise because when the axis is tilted so that the left hand is up, the wheel would be spinning in the same direction as the Earth's rotation and the inertia or centrifugal force would push in the opposite direction?
 
Dianne Werner said:

Homework Statement


If you are in the Northern Hemisphere and you stand on a rotating platform holding a spinning wheel and you tilt the axis so that your left hand is up and the right hand is down, why do you spin clockwise faster than the opposite way?(Right hand up?) It seems like since in the Northern Hemisphere the Earth spins counter clockwise, that the opposite would be true? Which way would the Torque push hardest? My experiment shows clockwise and I need to know why?

Homework Equations

The Attempt at a Solution

Welcome to the PF. :smile:

What reading have you been doing trying to answer this question?
 
The hemisphere you are on doesn't matter for reasonable parameters of the setup. Any differences you see should come from measurement uncertainties or other issues.
 
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Are you saying that the force should be just as strong clockwise as counter clockwise?
 
It doesn't have anything to do with the rotation of the Earth?
 
The rotation of Earth is completely negligible and its effect might be exactly zero in the setup you consider.
 
Dianne Werner said:
holding a spinning wheel
On a horizontal axis? Is the top of the wheel spinning towards you or away from you? Which way are you facing?
And what has this to do with centrifugal/centripetal?

But as mfb says, unless the wheel is huge, or spinning very fast, you will find it hard to detect an effect stronger than noise.
 
Last edited:
Dianne Werner said:
It doesn't have anything to do with the rotation of the Earth?
Consider the size of that effect.
It takes Earth 24 hours to turn 360 degrees.
How many minutes does it take to turn just a single degree?
 
  • #10
Was the platform actually a chair? Is it the sort that you rotate to adjust the height?
 

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