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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How is Gravity created in opposite to centrifugal force?

Wikipedia points out that Gravity is: most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a ...
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Lack of scale in Schrödinger equation for square-inverse potential

I see that if we set our potential in schrodinger equation to be a inverse-square dependence we don't have a typical unit of length as we have for hydrogen atom. $$-{\hbar^2\over 2m}\nabla^2\psi + {\...
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343 views

Can heavy water be isolated with water centrifuges?

If a container of pure water is rotated fast enough at high rpm, would $\mathrm{D_2 O}$ separation be feasible? Another way to ask is: it practically and physically possible with current technology ...
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Stress tensor associated with centrifugal/centripetal load

I have some trouble to understand the relationship between internal stress tensor and the external traction force (in this example, the traction force is a volumic centripetal force). Consider a cube ...
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What happens when one uses a blender in zero gravity?

I was recently told by a friend that using a blender type apparatus in a zero gravity environment will act like a centrifuge instead mixing properly. Is this the case? Furthermore, can anyone provide ...
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Can slow but long centrifugations substitute for fast but short centrifugations?

In many lab protocols, a specific centrifugation rate and time is usually required. For example, DNA precipitation protocols usually require that the precipitated DNA be spun at 12,000 g for 30 ...
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How realistic is a “bolas” system for artificial gravity in space travel?

The spinning space-station is very popular in sci-fi as a means of emulating gravity in space. But it requires rather a large diameter to minimise "gravitational gradient" effects and that means such ...
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Why is the water in a cup not inclined (opposite the cup) when the plane takes a turn?

When a aircraft takes a turn: Why is the water in a cup not inclined (opposite the cup)?
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Physical importance of centrifugal force and Coriolis force in the context of the restricted 3-body problem

In the textbook Galactic Dynamics (Binney and Tremaine), the restricted three-body problem to find the trajectory of a test mass that orbits in the combined gravitational field of two masses $M$ and $...
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Pressure at depth $h$ of a spinning bucket at top of swing

This was a question posed to me some time ago and it has haunted me ever since. Hints and suggestions would be awesome. Say someone is spinning a bucket of water in a vertical circle of radius $r$ ...
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Equivalent fictitious forces on rigid body

I know that when I study the motion of a rigid body from a non-inertial frame, I have to take into account the fictitious forces. However, it is not straightforward to find the resultant force (and ...
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If rock is melted and put in a centrifuge at high temperature, will the component chemicals separate?

Consider if you were on the Moon and did these steps: heat some lunar soil to well above its melting temperature put it in a suitable container on a centrifuge and spin it enough to overcome the ...
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57 views

Consideration of centrifugal force during descent

If we imagine an object falling from a height h above the surface of the earth. We can go into a rotating frame and therefore introduce Coriolis and centrifugal forces. Using the Coriolis force the ...
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Calculus of variations applied to a rotating liquid

I thought I knew how to use calculus of variations, but then I started thinking about the problem of a rotating liquid and it confused me a great deal. It would be nice to hear your thoughts on the ...
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When rotating a liquid-filled jar what determines how much force goes to spinning the specimen floating inside?

Another way of stating it: When you have leaves in a (cylindrical) tea cup, if you rotate the cup (eg clockwise), the leaves largely stay in place relative to the table, but spin clockwise a little. ...
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What is the maximum non-fatal force withstandable by a human being for a short period?

Assuming any (optimal) body orientation/position relative to the direction of force and mechanism of death. I'd be interested in a rough estimate of threshold force and a suggested mechanism of death....
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216 views

Separation of solids from liquids using magnetic waves

Using magnetic forces, I want to separate solids from liquids in a solution as a centrifuge would do. Is there a way to hit a volume of liquid and get it to separate liquids and solids with heavy ...
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How to represent a coordinate system precessing around the centre of force?

Is the centre of force same as the centre of mass of two rotating objects? If we set the coordinate system that is precessing around the centre of force, it will be a non-inertial frame of reference. ...
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Creating Artificial Gravity In A Smaller Craft Where Energy Was Not An Issue - Energy Required To Do So?

If you had a craft say the size of the spaceship in Guardian Of The Galaxy, big enough for a few rooms, etc. Now say you wanted to create gravity(artificial using centrifugal force) and energy was ...
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Centrifuge + doppler

Does the Doppler effect come into play in any interesting or useful way if a radio transmitter or receiver is spin in a centrifuge? For example, one whose radius was the same as the wavelength of the ...
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Extra energy in rotating frame of reference

Consider a particle at rest in frame of reference $S$. Its energy is $$E_S=0$$ (ignoring things like rest mass energy etc). Now suppose I move to a frame $S'$ which moves at speed $v$ in $S$. The ...
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Baseball In an O'Neil Cylinder

I am trying to understand the physics of a baseball game in a rotating spacecraft such as the O'Neil cylinder seen in the movie Interstellar. Imagine a cylindrical spacecraft of radius $R$ rotating ...
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What are the effects of centrifugal and Coriolis forces on an object moving in a rotating reference frame?

In a rotating reference frame, we usually come across the following two pseudo forces: Centrifugal force: $f_\mathscr{centrifugal}=-m\omega\times\omega\times r$ Coriolis force: $f_\mathscr{coriolis}=...
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Is Upside-down Racing Possible?

Based on the calculations I have done, upside-down racing seems to be possible. But in my mind, and certainly others too, it seems outlandish and impossible. Here is what I have come up with, please ...
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Y the relation among centripetal, centrifugal and gravitational force exerred on the moon is different from an object on the earth surface?

I read that since the earth vid rotating on its axis ,an object on the earth surface experiences a centrifugal force because the object is also moving around the earth's axis.So,that centrifugal force ...
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Weight at Poles and Equator Wrong?

Recently, I was thinking about the acceleration due to gravity on Earth when I remembered that I was taught that you weigh less at the equator because a fictitious centrifugal force "throws" you off ...
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Acceleration of free fall at different parts of Earth

“free fall is any motion of a body where gravity is the only acceleration acting upon it.” -Wikipedia Question 1 - If an object is falling freely, will it follow the Earth’s rotation too? Or will ...
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Centrifugal force and centripetal force in fixed coordinate frame

Hello I have a question related to centrifgual force. So in basic textbooks the movement of a particle in a rotating coordinate frame is derived. A starting point is to consider a fixed and a rotating ...
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Forces in washing machine

I have two front-loaded washing machines, when I wash shoes, in one of them the shoes seem to stick to the walls while it's spinning, but in the other I can hear them falling down now and then. What ...
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Force on object at South pole

If we have an object of mass $m$, moving on a path of constant longitude travelling at speed v, what will the force on the object be just as it passes the South Pole? We are to assume the Earth is ...
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Why a coin feels a force when it is put on a rotating horizontal disc

Suppose we have a disc which is placed in horizontal plane and have radius R. Disc is rotating and rotation axis is passing through center of disc and in vertical plane . Now we place a coin a on disc ...
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Work of centrifugal force cartesian coordinates

Hey I have a question about an expression in the textbook of Born. There a pendulum of variable is considered. Then it is stated that for shortening a work given by \begin{equation} -ml \int \dot{\phi}...
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Spaceship artificial gravity synchronization

Probably you remember the scene from "2001, Space Odyssey", where a small shuttle flies to low Earth orbit to reach a giant, ring-shaped mothership that rotates to generate artificial gravity, while ...
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Can i use gravity to represent gravitational force?

Deduction for gravity: (in both deduction, m is consider to be a point mass) deduction 1: On the surface of the earth, gravitational force FG can be separate to two force component : mg(gravity) and ...
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Ball in a spinning disc

So imagine we have a disc at rest and a ball at the middle of its radius. Now the disc starts rotating with constant angular velocity. Where will the ball go? Will it remain at $R/2$? Watch this ...
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How fast would the Earth have to spin to lose the atmosphere?

I have read these questions: How fast would the Earth need to spin for us to feel weightless? Why can't we feel the Earth (or being in any non-inertial frame) rotating? And it made me curious....
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Apparent forces in a rotating reference system

In Lanczos Variational Principles of Mechanics there's a subsection for apparent forces in a rotating reference system. It states that If the origin O of the reference system is kept fixed, the ...
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Water in a glass on a rotating disc

You put a glass of water on a record turntable and begin slowly increasing the speed. What happens first - does the glass slide off, tip over, or does the water splash out. I am particularly ...
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What is the difference in Accleration at Gravity ocean vs mountain & poles vs equator

This topic is a struggle because my Professor made me rewrite my paper because she doesn't want forces included. Please help because I am struggling to understand this. I have googled and this is so ...
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Why does a velocity that gives gravity's centripetal acceleration make you stay in orbit?

Explanations of basic orbital mechanics that I can find all go, $$\frac{v_{satellite}^2}{r} = a_c = \frac{F_{gravity}}{M_{planet}} = \frac{(\frac{G M_a M_s}{r^2})}{M_{planet}}$$ , and so you get a ...
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Strength of the centrifugal force

Let's say you're on a roundabout. When you're radially further away from the roundabout would you feel more centrifugal force or less? I feel like intuitively you'd feel less, but from the actual ...
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Difficulty in understanding why a car slips towards outside as seen from inertial frame

While turning on a road, why does a car slip towards outside, if we are observing the car from inertial frame of reference, i.e center?
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Various ways to relate Latitude and Acceleration due to Gravity

I was studying the effect of latitude on acceleration due to gravity. Note: Please note that in both the parts, the frame of reference chosen is the observer on Earth at that point. Part 1 I tried ...
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Centrifugal force observed from inertial frame

Suppose a ball is resting on a rotating disc ( rotating about an axis through its center ). For an observer sitting on the disc, the ball will move radially outward due to centrifugal force. A second ...