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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Where am i going wrong in this circular motion problem? [closed]

What am i doing wrong? Bob of a pendulum is taken to horizontal position and left. Find the angle of string with vertical when the vertical component of velocity is maximum. The vertical component of ...
Krishnaprasad R's user avatar
5 votes
1 answer
56 views

Can a homogeneous chemical solution really not be split by centrifuge?

Assuming I have a homogeneous solution such as salt in water. My intuition tells me that gravity or centrifugal forces would affect sodium ions more than water molecules. Theoretically, if I could ...
tobu's user avatar
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Centrifugal force has always been a nightmare to me

Suppose I'm in a rotating space station (that is somewhere in free space) and there is no other force. Now how am I supposed to fall to the circumference of the station if nothing pulls me? I will ...
Suhail Sarwar's user avatar
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Finding angular velocity of a frame given an angular velocity in another frame

I was trying to understand the Earth's frame of reference. You stick a coordinate system on the surface of the Earth and due to the Earth's rotation the coordinate rotates with respect to the axis of ...
Hammock's user avatar
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When calculating Lagrange points, $L_3$, $L_4$ and $L_5$ are good, but why are my $L_1$ and $L_2$ too close to the Earth?

I'm using python to calculate the Lagrange points of the Sun-Earth system. I started assuming that - for $L_1$ at least - the sum of the gravitational acceleration towards the Sun and the centripetal ...
OZ1SEJ's user avatar
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Can it be efficient to move by changing the center of mass?

(Note, I'm not a physics expert.) Imagine an elongated (oblong) device with some liquid inside. This device can change its center of mass by changing the distribution of the liquid. Let's say, the ...
Parzh from Ukraine's user avatar
1 vote
2 answers
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Why do a ring expand radially on rotating it?

The reason told to me is due to centrifugal force. But centrifugal force is a pseudo force so how can we observe its effects like increasing radius of ring in other frame. Also as per me due to ...
S K's user avatar
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Helicopter blade centrifugal force

Quoting from Prof. Leishman's book on Helicopter aerodynamics, the centrifugal force acting along the blade is calculated as below. My intuition is, not only the mass of the small blade element $dy$ ...
Testing123's user avatar
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Intuition on centrifugal force regarding a particular case

Let's consider a case in which a bucket is revolving in a vertical plane with gravity acting on it. At the highest position the gravity is acting downward but water is not going downward. Is this due ...
NAITIK VERMA's user avatar
1 vote
3 answers
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What is the force on this mass at rest relative to rotating disc

Hi I would appreciate help understanding this question, the answer is D but I do not quite understand why. It won't be B as if Friction acts in that direction it will go toward the outside of the ...
terry cruise's user avatar
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Why do we consider a non-inertial frame of reference for rotational motion but not for linear motion?

When we consider a body rotating around a central point, we say that pseudoforce acting outwards in the non inertial frame of reference keeps the body at rest in the frame of reference. If we consider ...
SeetheMoar's user avatar
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Using directed centrifugal force to create continuous acceleration [closed]

This is something that I've been curious about for a while now, and please understand I'm not a physicist by trade. I began this thought experiment thinking about how I've seen vibrations generated in ...
rubixibuc's user avatar
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Intuitive explanation of gravitational force being greater than normal force on a rotating planet? [closed]

It makes sense to me mathematically that an object resting on a rotating planet would go along with it and have a lower normal force because acceleration should point to the center of rotation. But ...
Human's user avatar
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Understanding effective potential gravity

Let's imagine that we have a planet orbiting a star, far away from any other influence. The gravitational potential energy is then given by the following graph, where $E = T + V$: Since $F = -dV/dr$, ...
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Minimum velocity to reach the peak in vertical circle is $√5gl$ or $√4gl$

I was reading vertical circular motion, and found that the minimum velocity required to loop the loop is √5gl where l is the length of the string/radius of the vertical circle. However when I also ...
Adhway's user avatar
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Can the tension on a rope for example diminish due to centrifugal force and if so why do we stay in orbit; what would happen if centrifugal force won? [closed]

the rope is made of string and the centrifugal force is only slightly stronger than the centripetal force will the rope tension be enough to keep the object there the centripetal force s 3 and the ...
nerd's user avatar
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Can someone answer a question about centrifugal force and gravity?

I have a question! I’m doing a school project on centrifugal force and gravity. I know that for every increase in speed, there is an expounding increase in pressure, which very quickly becomes some ...
ScienceRocks77's user avatar
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A Hotwheels Problem [duplicate]

I have a Hotwheels track set. It has a looped structure such that at some point in the car's trajectory, it becomes upside down. But in such a situation, it doesn't fall to the ground. I understand ...
Golden_Hawk's user avatar
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What force push ball outward in rotating tube in inertial frame? [duplicate]

Ball is free to move in hollow tube, if you rotate tube ball will move outward. What force push ball outward in inertial frame and how ball trajectory looks? (I know that centrifugal force don't exist ...
user707264's user avatar
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Weird sign in EOM: Centripetal vs. centrifugal term [duplicate]

Something goes wrong when I was deriving the equation of motion in Kepler's probelm, as below, Angular momentum conservation $L = Mr^2\dot{\theta}^2$. And Lagrangian is $L = \frac{1}{2}M(\dot{r}^2 + ...
Ting-Kai Hsu's user avatar
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Why use only centrifugal force in deriving formula of parabola formed by rotating liquid?

When a fluid-filled container containing an ideal liquid is rotated about its central axis with angular velocity $\omega$, the surface of the liquid forms a paraboloid shape. Now when we derive the ...
Aditya Mukherjee's user avatar
1 vote
0 answers
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Why is the conserved Lagrangian energy $E$ equal to the total energy in this example but not in a similar example? [duplicate]

I am aware that there exists duplicates to the title and have gone through the answers but it still doesn't answer my issue with a statement in the last image. These two similar situations with slight ...
Anonymousstriker38596's user avatar
1 vote
2 answers
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Explanation for radial elongation in rotating bodies

Why does a rotating body, like a rod or a spring, exhibit elongation instead of compression even though every part of it experiences "centri-seeking" force? Is it plausible to understand ...
Intrigued's user avatar
5 votes
2 answers
126 views

Will a very long space ship orbiting the Earth appear to have gravity to someone inside?

My friends and I have several disagreements about this scenario: Imagine a rigid cylinder that is the length of the diameter of the earth. At either end of this cylinder is a capsule with a person ...
Casey's user avatar
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Relativistic Centripetal Force/Centrifugal Effect

I wonder how would we go about to calculate centripetal/centrifugal acceleration for relativistic objects moving at near the speed of light , do we use the original acceleration = force/mass, or input ...
A Curious Mind 's user avatar
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Why can a car skid if you take a curve too quick?

I've seen loads of cars that skid during a curve due to taking it with a high velocity. I can guess that it has to do with the grid with the road and maybe something to do with centifugal forces?
Ulshy's user avatar
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Why does the centrifugal force act normal to the surface?

This questions comes from understanding the Tennis Raquet's Theorem, also known as Dzhanibekov's effect in this video: Veritasium's video On the second 8:36, we can see that when they try to add some ...
Ulshy's user avatar
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${}$ Conservative and Non-Conservative Forces

When we equate (with opposite sign) coulombic force to the centrifugal force for a electron revolving in the orbit. Basically we are equating a conservative force with the non-conservative force. Can ...
rahul pancholi's user avatar
7 votes
2 answers
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Do particles (e.g. atoms/electrons) in large molecules that rotate experience pseudoforces?

Imagine if you have a molecule with a large size, e.g. proteins. Anything that rotates experiences pseudoforces if my understanding is correct (e.g. coriolis, centrifugal etc). Since every molecule ...
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Curvature Drift In Plasma Derivation - But Centrifugal Force does not exist in inertial reference frame?

In the textbook 'Introduction to Plasma Physics and Controlled Fusion' (F. Chen) the Curvature Drift of a particle in a magnetic field with constant radius of curvature is derived like this: A ...
J. Grohmann's user avatar
1 vote
2 answers
71 views

Why don’t you fall when you lean on a bike while it turns?

Let’s say you’re on a bike and you turn left and also lean left with it. As we know fron experience you remain stable. How is this? There is obviously a torque caused by gravity at the center of mass ...
WilliamHarvey's user avatar
3 votes
4 answers
1k views

If object is at rest on a frictionless surface with no air resistance. What is the effect of Earth rotation and orbiting on object?

If object is at rest relative to the Earth's surface on a frictionless surface. What is the effect of Earth rotation and orbiting on an object? Does object rotate and orbit with Earth and stays at ...
123's user avatar
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Proof of Rayleigh's stability criterion for a rotating inviscid fluid using linear perturbation equations

This question is concerned with how to prove Rayleigh's stability criterion for a rotating inviscid fluid. I can follow the details of the proof up to the final line, but I cannot see immediately how ...
tokyojoe's user avatar
1 vote
3 answers
107 views

How high do the balls on a Centrifugal Governor lift?

Suppose you have one of these Centrifugal Governours or a similar object. How to calculate the height that these balls have when the construct is spinning at a given speed?
Xkeyscore's user avatar
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Does the centrifugal force varies according to distance of the observer (in a rotating frame of reference ) from the centre of rotation? [duplicate]

Imagine yourself in empty space. No stars. Nothing. You (Observer) are fixed on an invisible rotating disc (with angular velocity $w$) at a radius $r$ from the centre of rotation and you are observing ...
Aditya Kumar's user avatar
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1 answer
170 views

Work done by centrifugal force brings energy conservation violation? [closed]

The rotating body with ${m}_1$ mass rotates with angular speed ${\omega}_a$, with a $r$ distance from the center of rotation. The rotating body is kept in orbit by means of a rope which is considered ...
Eduard Oganesian's user avatar
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2 answers
62 views

Why doesn't a pseudo force act on an object placed on Earth's frictionless surface due to the rotation of the Earth?

One might expect a pseudo force to act in this case due to the Earth's rotational motion. Pseudo forces are fictitious forces that arise in non-inertial reference frames to explain observed motion. ...
Ayush Naman's user avatar
1 vote
2 answers
685 views

Centripetal force on the surface of earth

Initially, I was looking for how centripetal force is produced on the surface of the rotating earth for a mass kept at any latitude. I went through the following threads - Which force provides the ...
Apogee Point's user avatar
-1 votes
1 answer
51 views

Could a cylinder spacecraft (similar to an O'Neill cylinder) rotate indefinitely in the vacuum of space? [closed]

As oppose to a cylinder in two pieces rotating against each other, as in O'Neill's cylinder, what if the cylinder were all one piece and an external thrust, like rockets, set the cylinder in motion, ...
Ben Warner's user avatar
4 votes
3 answers
2k views

Questions about space elevators

I'm slightly confused about where exactly the forces involved in a space elevator are being applied, and my lack of a degree in physics makes it difficult for me to understand the sources that google ...
Dicerson's user avatar
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3 answers
275 views

What causes an object placed on the inner wall of a spinning cone to move up the wall?

I'm maddeningly confused about this problem conceptually. The solutions manual says that if the angular velocity is large enough, the mass will move up the wall of the cone. I can't convince myself of ...
nothingIsMere's user avatar
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3 answers
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If the Earth rotated slower about its axis, would your apparent weight increase or decrease?

The title above was a question on an exam that was marked wrong for me. I answered that if the Earth rotated slower (i.e. longer days), my apparent weight would increase. I based this on the ...
a3dur4n's user avatar
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1 vote
2 answers
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Centripetal force on a rotating bead

Imagine a bead that is fixed on one end of a rod, the other end of the rod is free to rotate about a pivot. If someone taps on the bead, then the bead will start to rotate about the pivot point. There ...
Irene's user avatar
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1 vote
2 answers
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How would centripetal and centrifugal forces vary in a rotating rod?

Suppose a horizontal rod (ignore gravity) of mass $m$ and length $L$ is rotating about one of its ends with constant angular velocity $ω$. Then, the tension must decrease as we move away from the axis....
CallousCalculus's user avatar
1 vote
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Liquid rotating in a cylindrical vessel

T.W.B. Kibble "Classical Mechanics" (1973) gives a few examples of the application of the centrifugal force. One such case is a liquid that is rotating inside a cylindrical vessel. Kibble ...
M. Wind's user avatar
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Force applied on edge of a cylinder due to water

We take a horizontal cylinder of length $L$ and fill it with incompressible water of mass $m$ and close the two ends with lids. If we start rotating the cylinder with respect to one of the ends,the ...
a_i_r's user avatar
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8 votes
2 answers
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Air pressure at ground level at the equator and the poles

At the equator at sea level you are about 17 miles higher up than at the poles ie 17 miles further from the center of the earth. Yet the air is not the same as it would be 17 miles up at a higher ...
Andrew Graham's user avatar
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1 answer
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Dynamics of a Centrifuge? [closed]

If $10\mathrm{\ Nm}$ of torque are applied to a centrifuge with ballast and payload and we assume that the weight of the centrifuge itself is negligible (ignored), then $5\mathrm{\ Nm}$ go to the ...
Dale's user avatar
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Motion of a bead along a frictionless rotating rod (constant angular velocity along one of it's ends, which is fixed [duplicate]

There's a horizontally placed rod, fixed on a vertical axis at one end, so it doesn't fall on the ground with acceleration $g$, and stays horizontal, there is a bead (mass $m$) near that end point ...
Gautam's user avatar
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3 answers
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The use of centrifugal force in highschool physics classes [closed]

I am a retired theoretical physicist in the Netherlands. I am currently trying to promote the exact sciences by helping highschool students with their mathematics, physics and chemistry studies. I am ...
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