Centripetal/centrifugal force

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?

The Attempt at a Solution

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?

berkeman
Mentor

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?

The Attempt at a Solution

Welcome to the PF.

mfb
Mentor
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.

haruspex
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?

mfb
Mentor
The rotation of Earth is completely negligible and its effect might be exactly zero in the setup you consider.

haruspex
Homework Helper
Gold Member
2020 Award
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:
DaveC426913
Gold Member
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?

CWatters