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Questions tagged [centrifugal-force]

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Pressure Difference in a Rotating Fluid Coloumn

This question has intriqued me because two methods are generally employed to derive the shape of the surface(paraboloid) . Both methods give equal numerical answer but differ in which of them P or Q (...
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1answer
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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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What happens when the centripetal force is equal and opposite to the centrifugal force? [duplicate]

We say that centrifugal force is fictitious, yet we still use it in some problems. If the centrifugal force is equal and opposite to the centripetal force wouldn't that make the net force zero?
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Why sand in a water collects at center on rotating the water? [duplicate]

We commonly observe that on rotating dirty water, the dirt in water collects at the center. But why does it happens, and why does it not collect at edges due to centrifugal force. Does something ...
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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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2answers
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Real and fictitious forces exerted on a mass hanging from a string

I am trying to figure out if I am right about this(picture at the bottom): Let's say we have mass M hanging from a string above the surface of the earth, creating θ degrees between it and the north ...
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1answer
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Why doesn't the Earth slowly collapse into the Sun? [duplicate]

I understand that the sun exerts a force on the earth and that if that was the only force exerted on the earth then the earth would have already crashed into the sun a long time ago. The reason the ...
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0answers
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Why spinning creates bulges? [duplicate]

Earth isnt a perfect but has bulges because of its spinning. What actually creates the bulges? Is the same reason that makes a liquid have v shape in a rotational tube?
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4answers
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Tension at extreme of a rotating rope of mass $m$

A uniform rope of mass per unit length $\lambda$, length $\ell$ is attached to shaft that is rotating at constant angular velocity $\omega$. Find the tension in the rope as a function of distance ...
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0answers
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Why is it that a stationary bike will fall but a moving one won't? [duplicate]

No matter how much I think about this I can't come up with a reason to me there is no difference In the forces acting against the tilting of the bike in both the cases as mothion is in the ...
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3answers
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Inertial frames and Rotation: shooting up a ball from a rotating platform

A short cylindrical tube is fixated in a horizontal platform and shoots a ball vertically in such a way that it falls back into the tube. Now imagine that the platform is spinning with a certain ...
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3answers
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Difference between center of mass and center of gravity

Let's consider a very tall building (g would be variable) which is rotating with the earth naturally. Now do the centrifugal force and the gravitational force act on the same spot? If not why does the ...
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1answer
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How to get the acceleration of a rotating mass from it's centrifugal and centripetal components

Suppose I pull out a rope and rotate a small mass as in the diagram with its speed constantly increasing Where: $Q_1$ is the path of the rotating mass $m$ $Q_0$ is the center of the rotating mass ...
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1answer
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Centrifugal force in effective potential

$$E = \frac { 1 } { 2 } m v _ { r } ^ { 2 } + \frac { L ^ { 2 } } { 2 m r ^ { 2 } } + U ( r )$$ This is the formula of total energy of an object with mass $m$ orbiting an assumed stationary body of ...
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4answers
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Question on equivalence of acceleration and mass with respect to gravity

Layman’s question here. Let’s say I’m standing on the inside rim of a rotating space station spun at right rate to produce earth-like gravity. Does the spinning warp space time? If so, how can a small ...
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1answer
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Centrifugal force on spinning black hole?

I saw the term spinning black hole popping up everywhere so my question do spinning black hole behave similarly to say a planet where it bulge in the equatorial and compress at the poles? what ...
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3answers
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How to make a boy fall from the merry-go-round?

I want to make this boy fall in the game and not able to figure out a way or formula which is responsible to make this boy fall from merry go round We know centrifugal force and centrifugal ...
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Does artificial gravity based on centrifugal force stop working if you jump off the ground?

In an answer to another question of mine, concerning gravity, there was a link to a video about creation of artificial gravity, based on rotation. The question I have might be silly (or with an ...
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5answers
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If centrifugal force is fictitious, what force is real in its stead?

Here's an example illustration: The way I understand it, when the car starts turning, the centrifugal force at first does not exceed the force of friction, which allows the car to stir. But at some ...
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2answers
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Deriving effective potential energy from the Lagrangian of a two-body system [duplicate]

I'm having some issues understanding how the effective potential energy of a two-body system is derived from the Lagrangian of the system. Specifically my issue is with one step... Suppose we are ...
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0answers
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What is the dynamics of centrifugal force in non-inertial system? [closed]

I am trying to intergrate the centtifugal force and the integral of φ(dφ/dt)^2 appears in polar coordinates. Does anyboby know if i'm doing something wrong or if i'm not, does anyboby know the ...
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3answers
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Do centrifugal force and gravity differ in their effects on objects?

If the type of object matters, consider the human body. If the situation matters, consider standing on the inside wall of an O'Neill cylinder compared to standing on the surface of Earth. "Differ in ...
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1answer
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Earth bulge and axis precession

We know that earth is not spherical because it spins. Does every object that spins bulge? for example a rotating wheel bulges? Also how moon and sun create the torque that shifts the axis of rotation (...
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5answers
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Is the normal force equal to weight if we take the rotation of Earth into account? [duplicate]

In my physics class we were doing problems such that we set $N$ (normal force) $= mg$. I understand that by Newton's Third Law, if I exert a force on the ground, then the ground will exert an equal ...
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0answers
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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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6answers
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How does rotational “artificial gravity” differ from normal gravity?

I am not a physicist, just a curious mind. I was reading a novel by Iain Banks where it was mentioned, that shifting from artificial rotational "gravity" (in space, on a rotating space craft) to real ...
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0answers
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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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4answers
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Why can't we feel the Earth (or being in any non-inertial frame) rotating?

I have read this question: Why can't we feel the Earth turning? My question is different, because that question does not talk about (only the comments) the fact (that I think matters most) that ...
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2answers
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What's wrong with the Big Spin Model?

A Dr. Serkan Zorba has a paper on arxiv in which he considers, what if the universe is actually slowly rotating? This gives rise to centrifugal and Coriolis forces on a galactic scale that seem to ...
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3answers
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Artificial gravity in movie Interstellar

Cooper Station is somewhat like a hollow cylinder. Buildings are attached on the surface. It has artificial gravity to hold on buildings and people. If, a person needs to fly in this spot Will the ...
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1answer
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A man on much faster spinning Earth decides to jump

Imagine that the Earth is spinning much faster than real situation and a man on the Earth's surface feels weightless. Suddenly the man decides to jump vertically with respect to the Earth. What will ...
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3answers
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What forces make objects fly away from the axis of rotation? [duplicate]

If two spheres are mounted on a smooth horizontal bar along which they can slide and were initially brought together and connected by a thread. Then the whole assembly is set into rotation about a ...
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1answer
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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
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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
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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
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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
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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
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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
129 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
105 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 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. I ...
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1answer
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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
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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
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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
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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.