Questions tagged [centrifugal-force]

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The Earth's Equatorial Bulge [duplicate]

It is stated that the Earth is a 'squashed sphere' due to the very slight bulge at the equator. (Thought in reality it's such a small difference, it's essentially spherical) Typical values: ...
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2answers
64 views

Are there any fundamental interactions behind centrifugal force?

Centrifugal force for the observer in a rotating frame is a force as real as the force of gravity. However I know that gravitational force is an interaction between a mass and another. And the agent ...
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1answer
40 views

Are my arms pulled outwards when I sit on a rotating office chair? [duplicate]

Suppose I am sitting in an office chair in a room. Now someone just starts to rotate the chair. The chair is now rotating quite fast. I think my arms will be pulled outwards. Now from my point of ...
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2answers
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How can this mass go off the edge of a disk?

If a mass rests at the edge of a disk, where friction acts on it, and the disk is rotated with an angular velocity just enough for this mass to slide out, then the linear velocity of the mass $v$ is ...
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1answer
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Earth as a perfect sphere and an object trying to stand still

I have imagined the Earth as a perfect sphere with uniform mass density and I put an object somewhere between the equator and the north pole at rest with respect to earth. And also in my imaginary ...
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1answer
81 views

Free fall in a centrifugal space ship?

I have read the basics on O'Neil cylinders. A tube with a five mile diameter rotating almost 23 times an hour would produce forces akin to earthlike gravity at the rim. There would be a space in the ...
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1answer
422 views

Difference between the energy and the Hamiltonian in a specific example

The problem is the following: Consider a particle of mass $m$ confined in a long and thin hollow pipe, which rotates in the $xy$ plane with constant angular velocity $\omega$. The rotation axis ...
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1answer
120 views

Does the weight of a spinning gyroscope change how much weight it can sustain (stabilize)

Hello I recently watched a video about gyroscopes and I wonder what changes the amount of mass it can keep upright. EDIT: I did search online but I couldn't find a website which explains this in a ...
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2answers
219 views

Centripetal Force on Springs

Please could someone provide an explanation for this. I thought that increased velocity would cause greater centripetal force (which, I think, acts towards the centre of curvature) so would the ...
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1answer
132 views

Tension of a string on a rotating sphere and under the influence of gravity [duplicate]

I was studying about circular motion and found a topic that is apparent weight and found an equation of apparent value of g. But I can't understand why this is written
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7answers
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Is the force which throws a body on a rotating disk outwards centrifugal force?

If some object is kept in a radial groove made on a disk and the disk is rotated with say constant angular velocity. Now as we know that the object moves outwards ie away from the centre of the disk....
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1answer
283 views

Is there an absence of centrifugal forces in rotating frame of a pulley or in belt friction derivation?

Considering a pulley or belt I understand the derivation of the difference in tension(capstan equation) due the resultant torque needed for the pulley to rotate. My question is for the tiny section ...
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4answers
3k views

Would there be centrifugal force if I were alone in the universe? [duplicate]

When I'm rotating, I feel centrifugal force. But if I were the only one in the universe and rotating, wouldn't I just kinda be still (since I'm not rotating with respect to anything) or would there ...
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2answers
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Why do tea leaves go to the center of the cup?

When I stir my tea with a spoon, I observe that the tea leaves all eventually concentrate in the center of the cup. Clearly they go against the centrifugal force. Why? Yet when I put the cup in the ...
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1answer
61 views

Why is the Earth not an exact sphere and what makes it bulge at the equator? [duplicate]

In chapter 7 of the Feynman Lectures Volume 1, Feynman explains that the Earth is round due to gravitation as everything attracts everything else. He also says that it is not an exact sphere since it ...
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1answer
65 views

Disparity in the equations of motion for a particle in a central field [duplicate]

Hello! I am considering the motion of particle in a central field and appear to derive inconsistent equations of motion when the Euler Lagrange equations are applied directly to (1) the Lagrangian $L(...
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8answers
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How does tilting a bike make it turn sharper?

Note that my question is not why do you tilt your bike when on a curve. It's about the reduction in turning radius when one tilts the bike inwards. Short to-the-point answers are welcome.
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1answer
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The other force in centrifuge

Consider a rotating centrifuge and a reference frame rotating with it. On every "piece" of fluid inside a centrifuge acts centrifugal force, but what are the other forces that make every piece stay in ...
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2answers
330 views

What effect does gravity have on a spinning object? [closed]

If gravity was the only force present would gravity, beside pulling, also stop the rotation / spin of a small object its pulling towards it over time? What would be the effect on an uneven object and ...
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0answers
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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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5answers
616 views

If centrifugal force isn't real then why am I being pushed on a merry go rournd? [duplicate]

I just finished my class on circular acceleration and I learnt that centrifugal force (outward force) is a psuedo force. It doesn't really exist. Now suppose I am going round in my car or a merry go ...
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1answer
78 views

Repulsive behavior of Newtonian gravitational theory?

I thought Newton gravitational theory of course is about attraction. but I saw the claim "the shorter distance (angular momentum)$^2$/$r^2$ repulsive behavior of Newtonian gravitational theory" in ...
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1answer
67 views

How do we not feel the speed of rotation of Earth?

Many people say, we don't feel the speed because everything around us including the air moves with the same speed, but I am not satisfied with the explanation. If it was so, shouldn't we feel a huge ...
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1answer
189 views

Gravitron Physics vs Spinning a ball in a glass

I have experimented with trying to "lift" up a ball inside a glass by spinning it. It works with a wine glass in which the top is narrower than the bottom but not with a vertical glass (I've used ...
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1answer
58 views

Could there be a moon orbiting so fast that the centifugal force is greater than its own gravity?

Could there be a moon orbiting a massive planet so rapidly that the moon's own gravity is less than the сentrifugal force from the rotation? What would be the implications in such a system? Would the ...
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2answers
67 views

Does the Earth volume increase with rotation?

By looking at the rotating car washing brushes, it can be seen that its volume increase with rotation and decrease when it's stopped. So, just for curiosity, would the earth volume decrease if it ...
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4answers
119 views

Is effective gravity constant over the surface of the ocean?

According to Wikipedia: The Earth is not spherically symmetric, but is slightly flatter at the poles while bulging at the Equator: an oblate spheroid. There are consequently slight deviations in ...
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1answer
231 views

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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1answer
60 views

Centripetal & centrifual force

we have a mass $m$ moving on the xy-Plane and we have the potential $U(x,y)=\frac{A}{2}(x^2+y^2) + B,\quad A,B>0$ with $A,B$ being constants. Now at $t=0$ we have $\vec{r}=(x_0,0), \quad \vec{v}=(...
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3answers
157 views

What is the motion of a mass 'circling' a spring?

Consider a situation whereby there is a mass connected to a spring which is initially unstretched and the system lies on a horizontal plane. An impulse is then applied to the mass giving it an initial ...
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3answers
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Centripetal & centrifugal forces [duplicate]

If there are no centrifugal forces in reality then how to explain weight loss due to rotation of earth or dynamic balancing of a rotating mass?
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1answer
354 views

Why do pseudo forces not obey Newton's third law?

Why is the statement, that centrifugal force as a pseudo force does not obey Newton's third law (action = reaction) ? Lets say I'm within a rotation g cage in space, then I feel weight right the same ...
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1answer
114 views

Can centrifugal force overcome other forces (in a singularity/Kerr metric)?

I have read these questions and answers. None of them answered my question. Typical rotation speeds for black holes Is there a physical upper limit on how fast a physical object can rotate? ...
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0answers
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Why do people float inside space station in space? [duplicate]

In the spaces station moving around the world, we can see that people are floating inside the station. There are two forces acting on the station. Gravitational force Centrifugal force Now these ...
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0answers
72 views

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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2answers
63 views

Can anyone explain centrifugation? [closed]

Why larger particles tend to remain at the bottom level of the test tube while the smaller particles form a layer above the larger particles?
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2answers
86 views

How does centrifugal force count on the ball-rope problem?

I'm whirling a ball tying it by a rope. Then at any instant the centrifugal force (outward force) equalizes the centripetal force (inward force) . Then both should cancel each other and there should ...
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1answer
67 views

How to understand $L_4$ and $L_5$ Lagrange points gravity balance? [duplicate]

It's relative easy to understand gravity balance of Lagrange points $L_1$, $L_2$ and $L_3$. But I am having a hard time to understand how a body would be "kind of" balanced out on Lagrange points $L_4$...
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1answer
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Can friction be static and kinetic at the same time?

We all know the classical question about a car driving at constant speed on a circular banked highway with friction. Turns out that there is a range of allowed velocities that the car can drive in ...
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1answer
105 views

How is centrifugal force derived?

So far, I've understood the meaning and derivation of centripetal acceleration as $v²/r.$ Centrifugal force is therefore basically mass times the centripetal acceleration. But how exactly is the ...
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2answers
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How do we explain defying gravity by objects on the wall of a rotating drum?

Image courtesy: The calculus story: A mathematical adventure; David Acheson How is the static friction balancing the gravity which seems to be provided by the normal force of wall on people. I ...
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1answer
114 views

Clarify vectors at angles of 90 and 270 degrees from the vertical for motion in a vertical circle

I believe the expression for motion in a circle, measured at the top and bottom of that circle,is $\frac{mv^2}{r} = T - mg$ where $mg$ is negative because it acts downwards at all times. I am ...
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2answers
1k views

Motion of bead on a rod

Why does the bead that is free to move on on a frictionless rod, move outward when the rod is rotated with constant angular velocity about one of its end? So, due to change in direction there is ...
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1answer
366 views

Does centripetal force exists with centrifugal force?

Is it true that where centrifugal force is in action, centripetal force is also existing. Can someone explain this through examples such as a centrifuge or centrifugal pump?
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0answers
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Estimation of Equatorial Bulge of the Earth [duplicate]

My dynamics lecture notes repeat the Earth's equatorial bulge can be approximated as: $$ \approx \frac{\Omega^2R}{g} \approx \frac{1}{300} $$ (Do they mean R/300?) They also include statements like: ...
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1answer
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Why does $F_\mu=m\frac{v^2}{r}$ show that it only is the friction that keeps e.g. a car on the road?

I'm reading physics last year at a Swedish Gymnasium (equivalent to High School/College) and have a problem understanding a concept in the following text. Translated text: A car with the mass $m$ ...
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1answer
277 views

Practicality of a centrifugal space launch system

So, I read this article: https://techcrunch.com/2018/02/22/spinlaunch-2/ (TechCrunch seems to have issues with this URL: here's one from the Wayback Machine that seems reliable: https://web.archive....
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4answers
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Why does a leaning bike not fall over?

This question has been bothering me for a while now. Everywhere I look, everyone talks about 'fictitious forces' and how they apparently explain the bike being in equilibrium. However, if we just look ...
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2answers
814 views

Difference between the Coriolis effect and the Eötvös effect

The coriolis accelaration is $-2\Omega \times u$, where $\Omega$ is the earths rotation and u is the velocity in a basis following the earth. When something moves east/west, this results in ...
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2answers
518 views

Problem regarding concept of weightlessness [closed]

A simple pendulum having a bob of mass m is suspended from the ceiling of a car used in a stunt film shooting. The car moves up along an inclined cliff at a speed v and makes a jump to leave the cliff ...