# Questions tagged [centrifugal-force]

Centrifugal force is an inertial (pseudo or fictious) force used in a non-inertial frame of reference in order to apply the Newton's laws of motion. If your question is about centripetal force, which is a real force that points towards the center of a circular trajectory, use the tag "centripetal-force" instead.

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### Difficulty understanding why acceleration of free fall is lower at the equator than the poles

I have been told that the acceleration of free fall is lower at the equator than at the poles, and that this has to do with the fact that at the equator, you are moving with circular motion so ...
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### Why are planets not torn apart?

There are two forces we know, Centripetal force (or Gravity) and Centrifugal force. Both are applied to all the planets including earth. Planets are kind of spherical due to gravitational force but ...
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### Do you experience no centrifugal force when in orbit?

I think that the answer is no, but in some sense it feels counter intuitive so I just wanted to check here. So if I understand it correctly, the General theory of relativity tells us that any ...
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### Does the centrifugal force exist in inertial frames too?

Suppose I have a string hinged at one end and the other end attached to a body is to start a circular motion. We all know that the tension force is just an aspect of the electromagnetic forces ( ...
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### Does a rotating rigid ring (or other rotating rigid body) in space generate heat?

I don't have training in physics (so forgive me if I use the wrong terms or mix up concepts), but I was thinking about “artificial gravity” in space. If a spaceship were being propelled by some force, ...
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### Centrifugal force of static observer at North Pole

This question is somehow related to Newton's bucket and absolute rotation concepts, but applied to a simple, tangible scenario. Let's suppose I could hover over the North Pole, and "detach" ...
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### When a train starts, the head of a standing passenger seems to be pushed backward. Can we consider it as pseudo force?

Pseudo force always acts in a non-inertial frame and it is always opposite to the direction of the body's acceleration. The backward push is of course inertia, but can we consider it in this manner (...
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### Can centrifugal force inside Earth's outer core overcome gravity?

As the gravitational field inside Earth outer core is relatively weak can the angular momentum of Earth's outer core be high enough to cause lighter elements or compounds being deposited in Earth's ...
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### Centrifugal pressure of the inner core towards the outer core of the Earth

As we go towards the center of Earth the gravity weakens. Does that mean that due to absence of gravity the outer part of the inner core exerts a pressure against the inner part of the outer core of ...
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### General relativity and absolute rotation

Are both centrifugal force and Coriolis force really fully explained by what is called "frame dragging" in GR? And if that is correct, does this concept "frame dragging" solve the ...
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### How is centrifugal force doing work here?

Q) A plane spiral made of stiff smooth wire is rotated with a constant angular velocity $\omega$ in a horizontal plane about the fixed vertical axis O. A small sleeve M slides along that spiral ...
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### What is the concept of “Centrifugal Force”?

Pls explain the intuitive concept of centrifugal force in different situations.
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### What about Newton's potential prevents singularities in the two-body problem?

The solutions to the gravitational two-body problem can be described by conic sections. In particular, two abstract point masses don't collapse into each other (that is, do not get arbitrarily close ...
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### Are most planets hollow?

You bore straight down inside the Earth. The further you go, the less gravity you experience, because mass above you grow, and mass below you shrink. At the (ideal) center, gravity cancels out to zero,...
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### Why is the moon in free fall? Isn't there a centrifugal force acting on it? [duplicate]

An object is in free fall when the force acting on it is exclusively gravitational. But why then is the moon in free fall? Isn't there a centrifugal force acting on it?
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### Bending of a cyclist while taking a turn on a horizontal road

I am a high school student and my teacher taught me that a cyclist bend while taking a turn on a horizontal road because if he doesn't bend it then it will rotate due to net torque of friction about ...
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### How can the Normal Force on an upside down roller-coaster car point upward?

Q: An amusement park proprietor wishes to design a rollercoaster with a vertical circular loop in the track, of radius $R = 20\, \rm m$. Before the cars reach the loop, they descend from a maximum ...
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### Centripetal force for a rotor or centrifugal force?

From basic physics any object experiencing a uniform circular motion, experiences a centripetal force. However in electric machines at high speed the rotor would be deformed outward as if a ...
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### How does effective potential reduce a two variable problem into a single one?

https://en.wikipedia.org/wiki/Effective_potential In this wiki link, They write $$E = \frac{1}{2} mv^2 + \frac{1}{2} mr^2 \omega^2 - \frac{GMm}{r}$$ Then they sub $$L= mr\omega$$ Which turns the ...
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### Why is the centripetal force non-conservative while the centrifugal isn't?

Aren't both perpendicular to $R$? Also, doing $\nabla \times \vec{F}$ using $\hat{r}$, $\hat{t}$, $\hat{k}$ as versors (with $t$ tangent to $r$ and $k$ perpendicular to the surface) i get $0$ with ...
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### If the fictitious forces (ex: centrifugal) help the observer feel stationary, why does the person feel a force in the opposite direction?

I searched and viewed similar questions on here but still am very confused. Is it because of the observer's inertia? If so, shouldn't we feel a 'push' towards the point where we are actually ...
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### How to understand pseudo forces in the Lagrangian formalism?

Consider a free particle in a rotating reference frame. Let us say the coordinates of the particle are given by $(x',y')$ in this frame. For an observer on this frame, (I suspect) the Lagrangian is ...
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### Feynman 20-4: Question regarding centrifugal force and rotation in three dimensions

For full reference, refer to https://www.feynmanlectures.caltech.edu/I_20.html#Ch20-SUM Here's the quote that I think is relevant to the question: 'Consider a wheel that is fastened onto a shaft in a ...
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### Gravitation: Collision of a satellite and Meteorite [closed]

A satellite is orbiting around a planet in a circular path of radius $R$. A meteorite of mass $m$ collides with the satellite and sticks to the satellite. After collision, the satellite is seen to ...
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### Are Newton's equations accurate on Earth when we ignore fictitious forces?

I am a high school student and I just got to know about inertial and non-inertial frames of reference. And since the earth is actually accelerating around the sun, and the sun is also accelerating, ...