# 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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1answer
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### Particle over a hemisphere

A smooth sphere of radius $R$ is made to translate in a straight line with a constant acceleration $a$. A particle at the top of the sphere is released from there at zero velocity with respect to the ...
2answers
37 views

### Why do I feel centrifugal force If I move with constant speed on a turn?

Title sums it up pretty much, I'm studying for my physics exam right now and I just can't wrap my head around this
2answers
27 views

### Mass in calculating centrifugal force

I am having trouble understanding the "mass" in a spring-loaded system rotating at a distance $r$ from the axis of rotation, used in the equation $F = mr\omega^2$. If the spring is attached ...
0answers
33 views

### Does gravity play a role in d'Alembert virtual Power?

Based of the virtual power principle, we can obtain the following equation. $\ {F(P)v(P)+Fi(P)v(P)} = 0$ If we now take a rotating link of length $\ {l}$, that has a center of mass on $\ {0.5l}$ (...
1answer
60 views

### Centrifugal force misconceptions

I am a high school student and I want to know that how centrifugation technique really separates substances according to their molecular masses? In many books and sites, it is written that it is ...
0answers
19 views

### What is the distribution of centripetal force on interior surfaces of a body spinning on multiple orthogonal axes?

This is in reference to a question first asked five years ago: “Why would a spinning space station create a centrifugal force on an astronaut rather than simply spinning around him/her?” So – to throw ...
3answers
57 views

### Rotating conical pendulum and the centrifugal force

The following diagram summarizes what, I think, are the forces involved in the movement of a rotating ball at the end of a rope. Here, tension and weight are real forces (non fictitious) for an ...
1answer
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### Conceptual Doubts regarding centripetal acceleration of rolling objects

Centripetal acceleration of a point with velocity $v$ and moving on a path of radius of curvature $r$ is given by $v^2/r$. If $v= rw$ where $w$ is angular velocity of a body , then centripetal ...
1answer
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### Why a rotating ball (at the end of a rope) does not fall down?

Is the explanation shown in the diagram right? This is: the net force F1 = tangential + tension is way much bigger than the weight of the ball and, therefore, the resulting force F1 + weight is F1 so ...
0answers
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### How much centrifugal force would it take to create gravity?

If say your car was stuck in the mud. You press the gas the wheel spins and the centrifugal force shoots mud out the back, how fast would the tire need to go to keep the mud perpetuating around it ...
2answers
42 views

### Does centrifugal force transfer in a vacuum?

Let's say there is a closed cylinder floating in space, experiencing no acceleratory forces. Suppose the cylinder is 200 ft tall and has a 75 ft radius (arbitrary selections). Lastly, let's say ...
0answers
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### Inertia and centrifugal force

So I actually had this thought a long time ago and have been curious about it ever since. I saw something on flying saucers and I was curious about the spinning that they are portrayed to do. That got ...
2answers
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### Gravitational Force & Normal Force

Imagine a moving ice-block on an extremely smooth (i.e. friction is zero) and circular, rogue planet devoid of an atmosphere. Assuming that the planet in question is far away from any (massive) object ...
2answers
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### Can a cylindrical chamber geared into a larger one on the outside decrease the size need for artificial gravity? [closed]

I’m designing a interplanetary ship and I’m trying to figure out how to fix the large size required for a ship with artificial gravity given budget. My question is if there was a main cylindrical body ...
2answers
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### Existence of centrifugal force in question

I am new to circular motion.I came across a question which had a car going up the top of the hill in which we were asked about the normal reaction on the car due to its movement along the curved part. ...
1answer
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### Pseudo force and Potential energy

The pseudo force equation is $$\vec F_p=-2\,m\,(\vec \omega\times \vec v)-m\,(\vec\omega\times (\vec\omega\times \vec R))$$ where $~\vec v=\dot{\vec{R}}$ and $~\vec\omega=\text{const.}$ the pseudo ...
5answers
3k views

### Thought experiment: Does “artificial gravity” created in a spinning spaceship last forever?

We know a body in uniform linear motion will continue to move with uniform velocity unless any external force acts on it. Similarly, a body rotating with uniform angular velocity will continue to ...
2answers
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### Is it possible to generate artificial gravity without using a centrifuge system?

I was doing research on General Relativity and Einstein's field equations and pondered on a device using that would generate artificial gravity without the use of rotational forces. I wondered since ...
3answers
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### Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator?

Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator? Maybe also a question for 'GSE' but if we deal with centrifugal forces and ...
2answers
185 views

### The 3 apparent forces of the rotating frame in Quantum Mechanics

I was wondering how to derive the 3 typical "fictitious" forces that arise in a rotating frame. Their derivation in classical mechanics is clear to me, but not in quantum mechanics. ...
1answer
53 views

### Pressure change caused by rotation contradiction (Rotating fluid in a bucket)

I am reading through this article which analyzes the pressure in the liquid rotating in a cylindrical container, in it there are two expressions derived for height of the liquid which seem to be ...
5answers
520 views

### Is circular motion possible for an object $A$ with some initial velocity being attracted by a much larger object?

A particle $A$ is initially given some velocity and is being attracted by a large object $B$ ($m_A\ll m_B$). Do there exists an initial velocity so that the particle $A$ describes a circular motion ...
3answers
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### Can a very fast centrifuge affect the path of a light beam?

I am thinking the answer is "no" since you can't see time dilation (I have read) in a centrifuge. But why would a light beam not be bent by what is felt like gravity to someone inside the ...
3answers
81 views

### Why do centrifugal force and centripetal acceleration have opposite signs?

I know that rotating body has centripetal acceleration that is directed to the center of rotation. $$a_{cp}=-\frac{v^2}{R}$$ (Lets imagine that body is located at 12 o'clock and that Ox axis is ...
2answers
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### Calculating g-force of spinning a toddler

I sometimes spin my nephew on the ground (we have a very slippery floor). So as my nephew is $90 \; cm$ tall and I rotate him roughly $60$ times a minute, I'm applying a g-force of $1.8$ according to ...
0answers
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### Particle in Cyclone - height of pipe that will keep the particle pressed against the inside wall

I'm trying to determine the required radius, $R$, and length of a hollow cylinder, $L$, to keep a particle that enters tangentially with an initial velocity $V_{t,i}$ at the top of the cylinder "...
3answers
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### Centripetal and centrifugal acceleration in an athletics raceway (for example)

I consider this question and the answer of the user @Bob D in this link: Centripetal and Centrifugal acceleration/force. When an athlete runs round a curve in the atletic track he will be subject to ...
0answers
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### Centrifugal compressor calculation [closed]

I'm trying to get a rough idea of the different variables in an air centrifugal compressor (especially the RPM of the impeller). Being more specific, is there a way to roughly estimate the RPM of the ...
1answer
28 views

### How does the centrifugal force act upon sound?

I kind of know what happens when you act with a centrifugal force upon a material object, but what about sound? For example, grabbing a phone who has music turned on and spinning it in the air? Thank ...
3answers
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### Can I use the formula for the centrifugal force to solve this gravitation related exercise problem?

I have a problem in which I need to find the kinetic energy to put in orbit a satellite already at a height $h$. So far I have worked out that $F_g = F_c$ (gravitational force = centrifugal force) so ...
1answer
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### Can you determine the speed needed to make a corner with using centripetal as well as centrifugal force? [closed]

A car weighing 800kg is driving on a motorway. It accelerates from 0 to 100 km / h in 3.5 s; this acceleration is only limited by the grip of the tires. a)How fast can it go in a curve with a radius ...
1answer
26 views

### What are all the forces a person is subjected to in a G force simulator centrifuge?

Question What are all the forces a person is subjected to in a G force simulator? Details In a G force centrifuge a test pilot is exposed to high G forces, however recently I've been learning about ...
0answers
26 views

### What if there's no friction In the Ball on a rotating disc problem?

In the rotating frame of the disc , how does centrifugal and coriolis come into play if there is no friction? The ball is kept at r in rest on the disc. And then the disc is made to rotate. Now from ...
1answer
56 views

### On the working of the centrifugal force

I get that centrifugal force is what appears to force you out of a circular motion if you don't have the centripetal force required to stay in it. For example, a stone being whirled around on a string ...
1answer
50 views

### Equivalence principle and rotating frames

I understand that an observer in an uniformly accelerating frame in "free space" cannot distinguish this condition from the presence of a gravitational field. Or, at least, this holds "...
2answers
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### When does Coriolis and centrifugal force act?

Ok so here is the situation you are on a disc rotating with the same angular velocity at the center so you are in a rotating frame of reference. A block is placed. Case 1: The disc is frictionless. ...
5answers
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### Centrifugal Force Dilemma

While learning Classical Mechanics, I am confused on nature and application of centrifugal force. In my textbook, it is written that centrifugal force is a pseudo force that, depends on reference ...
2answers
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### Direction of centrifugal force at different latitudes

Why is the direction of centrifugal force acting parallel to the equator rather than perpendicular to the centripetal force on 3D rotating spherical objects like the Earth? I'm having trouble ...
1answer
29 views

### What is the equation for the empty space created when centrifugally casting?

When metal is centrifugally cast, it is poured into a circular die which then spins, forcing the metal outwards to create a cylindrical part. Im attempting to create a visualization of this phenomenon ...
2answers
85 views

### What happens when the centrifugal force and Coriolis force combine?

Imagine someone is walking on a merry-go-round as it spins. Let's say the merry-go-round has a painted circle on it that is concentric with the outer edge of the merry-go-round and the person walking ...
2answers
108 views

### How to explain the Earth's Equatorial bulge without centrifugal force?

There are many answers to the question why is the Earth bulged at the equator, see e.g. here, but almost all of them involve centrifugal force. Since it's a fictitious force, how to we explain this ...
4answers
768 views

### What are Lagrange points?

We were taught that Lagrange points are where the resultant gravitational intensity is zero. Does that mean the resultant gravitational attraction of an object kept there is zero? If that's the case ...
1answer
25 views

### Is a deforming force tension acting on the Moon while orbiting Earth?

As the Moon shows only one face to the Earth can this statement be correct:As a point mass closest to Earth should orbit Earth faster than the most distant point regarding Earth according to the Law ...
2answers
106 views

### A ball held by two strings is rotating around a pole. Find the tension in each string [closed]

The problem is the following: I notice that this is an equilateral triangle meaning that the angle below and above the dotted horizontal line is $\frac{\pi}{6}$ rad. I then draw a force body diagram ...
6answers
899 views

### Why don't we consider centripetal force while making FBD (free body diagram)?

Consider a situation where a block is kept on a wedge which is further kept on a surface which rotates with $\omega$ the FBD for the same My question is why dont we consider centripetal force in fbd? ...
1answer
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### If Earth is oblate why don't oceans flow to the Poles?

The Poles are ~21 km downhill from the equator in a spherical coordinate system. So why doesn't water pool there?
2answers
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### Bulging of Earth

Earth is bulged out due to the outward radial push of the centrifugal force. For an inertial observer, there must be some force causing this outward push other than the centrifugal force (since ...
6answers
111 views

### How did the ball know that a vertical circle follows a slope at the point $A$?

A ball (mass $m$) slides from rest down a frictionless track which consists of a slope followed by a vertical circle. Please see the picture below. The original question asks for the normal force at \$...
3answers
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### Can the Lorentz force cancel the centrifugal force in a non-inertial reference frame?

Can a Lorentz force cancel a centrifugal force (same value, opposite vector) in a non-inertial reference frame?
1answer
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### Finding the equilibrium point of a system that rotates and oscillates [closed]

I'm currently learning physics and I don't always know the right approach in order to solve a problem. I ran into a problem with some sort of oscillation combined with a circular motion. Problem: An ...