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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End motion of an empty spherical shell with a ball rolling on it's inner surface

Let's picture an empty sperical shell in inter galactic space or beyond. Inside this shell, a ball is rolling on the inner surface. Because of friction and the centrifugal force the ball exerts on the ...
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What is the action pair of normal reaction in case of bike riding along a curved vertical wall

I was reading about a situation in my brother’s physics textbook where a bike is riding along a curved vertical surface. It’s mentioned there that normal reaction provides the centripetal force and ...
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A simple proof that under Newtonian gravity rotating massive bodies are ellipsoids?

Here is my attempt at deriving the shape of an idealized rotating massive body under Newtonian gravity, assuming that the gravity force points towards the center of mass and shape of the body is ...
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Does the Lagrange Point $L_3$ exist in practice in the multi-body solar system?

Lagrange Points ($L_1$ through $L_5$) in a restricted 3-body system are well documented. Traditionally body 1 (M1) is the central object with a mass much greater than the other two objects. M2 is ...
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What would happen if the Earth rotated at the rate required to achieve orbit at its radius? I.e ~7k m/s instead of ~460 m/s

To achieve a circular orbit, you need to have a velocity of $$v = \sqrt{Gm/r}$$ which is about 7 km/s at the Earth’s radius, but the Earth’s rotational speed is only about 460 m/s (by taking the ...
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Could we measure fictitious forces arising from rotation about an axis in a fourth spatial dimension?

Two-dimensional creatures confined to a flat sheet that was uniformly rotating around an axis perpendicular to the sheet would have no trouble identifying that their sheet was rotating. They would be ...
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Centripetal acceleration in rotational and translational motion

How do you find the centripetal acceleration of any point on a body performing both rotational and translational motion. For example, in pure rolling if we find centripetal acceleration of the topmost ...
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What is the name of the instrument that separates substances using an electromagnetic field, similar to spectrography

As far as I remember, the elements of the substance are passed across an electromagnetic field in such a way that they seperate as the electromagnetic field alters their trajectory. I also seem to ...
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Heavy mass vs light mass in circular motion

If I have 2 spheres with different mass in a spinning Y shaped tube(no water is in the tube),                                                              which one will go higher because of inertia ...
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Angular momentum in a centrifuge

Just a curiosity, centrifuges are ideally perfectly balanced, but can tolerate some level of imbalance. Is this due to the angular momentum of the rotor residing rapid oscillations in tilt? How would ...
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Central force problem: the basics

In a central force problem, let $r'$ mean the derivative of the radial distance with respect to time, then (m$r''$ - mr$\theta''^2$ )($\vec{r}$) = f($\vec{r}$) , the radial force. Please check if ...
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Gravitational force, centrifuge?

So after going through 5 pages on google on why and how a centrifuge separates out particles of different densities, I still don't quite get this. If Galileos statement is right that force can be ...
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How to understand what causes the centripetal force in this situation and what would be the direction of those forces and the centripetal acceleration [closed]

A table with smooth horizontal surface is turning at an angular speed $ω$ about its axis. A groove is made on the surface along the radius and a particle is gently placed at a distance $a$ from the ...
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How large are the fictitious forces due to our orbit around the galactic center?

When we are in a non-intertial system, this creates fictitious forces. Some well-known fictitious forces are the centrifugal and coriolis forces. Those are caused by the Earth's spin around its axis. ...
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On a Torus World and the force upon inhabitants

I am looking into torus worlds for fiction, and I know how to calculate the necessary speed to rotate, and necessary radius, for such a world to get a specific force of gravity. But what I am ...
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Does the free surface of a liquid in a rotating frame depend on the viscosity?

If we consider an incompressible, isothermal, stationary Newtonian flow (density ρ =const, viscosity μ =const), is it true that the form of the parabolic free surface in a rotating frame (constant ...
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Centrifugal force effect in a rotating frame of reference

If the centrepital force doesn't exist in a rotating frame of reference, then in this frame perspective, how can we explain why a ball tied to a string following a circular motion not to be pushed ...
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Can objects in space maintain a stable rotation spinning on two (or three) orthogonal axes simultaneously?

Could a space station spin on two (or three) orthogonal axes at once and maintain a stable rotation? If the station was a hollow sphere, would the centripetal force be equal everywhere on the interior ...
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What is the extra kicks to accelerate a spacecraft during gravity assist?

Suppose a spacecraft coming from behind a planet during a flyby, it gets a boost in speed and also change in direction of travel but where does this extra kicks come from? Now that I understand ...
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How would a game of (American) football work on a space station generating artificial gravity by using spin? [closed]

Using rotation to generate artificial gravity is pretty common in sci-fi. I know the TV show "The Expanse" features it on the Mormon's vessel. I also remember a small-scale rotating space ...
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Can this phenomenon be explained in ground frame?

Suppose there is a disc which is rotating about its centre with constant angular velocity, the surface of disc is rough and there is a small block at some distance away from centre (at rest initially),...
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How does Lagrange point $L_2$ provide even meta-stability if centrifugal force isn't real?

I recall hearing, perhaps colloquially, that a centrifugal force doesn't exist. It can be mistakenly felt but, it is not a real force. Given this, how does the $L_2$ orbital point exist beyond the ...
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What is causing this sign difference in the centrifugal term between Lagrangian and Hamiltonian formalism? [duplicate]

Consider a central force problem of the form with the Lagrangian $$ L(r, \theta, \dot{r}, \dot{\theta}) = \frac{1}{2} m \left( \dot{r}^2 + r^2 \dot{\theta}^2 \right) - V(r), $$ where $r = |\vec{x}|$. ...
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Why does a mass move out when rotating?

If a mass $m$ is put on a stationary table, and then we start rotating the table counterclockwise, the mass will fall from the table, as can be seen in this video https://youtu.be/IOcrHOc23N4?t=187. ...
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Liquid behavior in a rotating space station

For a novel I'm writing, does a liquid's surface (e.g. coffee) slope upward in the opposite direction to the spin of the torus in a space station such as in 2001? I'm guessing it does due to the ...
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2 votes
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Maximum rotation speed of a planet of given mass and size

What will be the limit of the rotation speed of a planet with given radius and size? will it depend on factors other than mass and size? Neutron stars are known to rotate at very high speeds but they ...
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Why does centrifugal force arise? [duplicate]

We define centrifugal force as the outward force which a body experiences in circular motion. But i have few confusions in this topic: Why does the centrifugal force arise? If it acts on the same ...
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How is energy conserved in a system involving centrifugal force?

Assuming there are two pieces of machines that are used to simulate kicking soccer balls. The machines are identical to each other except for the lengths of "leg" that is used to kick soccer ...
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Centrifugal Force: Why is it so real even from non-inertial frame? [closed]

I have thought about this for quite an amount of time. The questions: (1) Suppose we tie a ball on a merry go round with a string. Now, we observe the ball from the merry go round and from the ground. ...
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How to use Bernoulli equation in a rotating frame and is it always true that bernoulli will work?

Lets say a fluid is rotating in a cylindrical shape container with every circular fluid streamline rotating with same $w$ by some external mechanism, now imagine asking for pressure difference between ...
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Can a rotating neutron star collapse to a black hole through a reduction in rotation?

It is well known that non-rotating neutron stars cannot grow without bound, since an increase in mass causes a proportional increase in density, and accretion beyond a critical limit would cause it to ...
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Pseudoforces as seen by observer in a non-inertial frame

Suppose, we have a car, that is accelerating with respect to an inertial frame, with an acceleration $a_c$. So, observers in the inertial frame can claim that there is a force $F_c=ma_c$ acting on the ...
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Force required to keep a car from sliding out of a curve

I am a high school student trying to get an intuitive understanding of centripetal and centrifugal forces. I can calculate the correct solution but I don't understand the meaning of it. In class today ...
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Can you calculate the sedimentation rate of a coarse chemical suspension under gravity using a centrifuge?

If the sedimentation rate can be determined for a coarse chemical suspension or a suspension containing large particles (i.e., particles with radii between $100$ to $200 \mu m$) in a medium like ...
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How to use Centrifugal force in a rotating frame?

Assume a stationary object (point object) on a smooth very large disc at a distance $r$ from its axis perpendicular and passing through the centre. (No external forces apart from gravity and Normal ...
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Inside an O'Neill cylinder, would a Pendulum's swing have any notable characteristics?

Objects inside an O'Neill Cylinder would feel the Centrifugal effect, given by: $F=mω^2r$, and the Coriolis effect, given by: $F=d(mv)/dt$, as well as air friction from air under the same effects. At ...
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Why is the force we experience the normal force and not the net force?

I was doing some circular motion questions, and in every example to calculate a person's apparent weight/force that they experience, you find the normal force. For example when you're at the top of a ...
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Solving differential equation using Bertrand's theorem and Fourier

So I had a equation : $$m\ddot r=\frac{e^2}{r^2}-\frac{l^2}{mr^3}$$ This was obtained via Hamilton's equation on a Bohr atom. I read somewhere that this has a complex yet periodic solution, as proven ...
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Applying centrifugal forces [closed]

Three identical cars A, B, and C are moving at the same speed on three bridges. Car A goes on a plane bridge, car B on a bridge concave downward, and car C goes on a bridge concave upward. Let $N_A$, $...
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What would be the result of a body decreasing safe speed in a banked circular arch?

A banked circular arch of radius $r$ makes angle $\theta$ with the ground. Any moving body of mass $m$ having speed $v$ can cross the arch safely. If they fall off from the arch for increasing speed ...
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Does the centrifugal force of a rotating object acts at this same rotating object?

when rotating an object by a string a centripetal force from the string will act at the object towards the center and by Newton's 3rd law an opposite force will act at the string by the object . Then ...
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Apparent weight in diurnal motion

An object of mass $m$ is on the equatorial plane. Now it is moving in a circle of radius equal to the radius of earth $R$. The object is moving with angular acceleration $\omega$. Let us observe from ...
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Why do we consider $L^2/(2mr^2)$ part of effective potential energy?

The energy of a particle under the action of a radial conservative force is given by $$E = \frac{1}{2}m\left(\frac{dr}{dt}\right)^2+ \frac{L^2}{2mr^2} + U(r),$$ where the last two terms provide the ...
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Question regarding expressing the basic physics quantities (ie) Position ,Velocity and Acceleration in Polar and Spherical Coordinates

In Cartesian Coordinate System, the position of an object is given by a position vector: $$\vec R=X \hat{i} + Y\hat{j} $$ We move $X$ units in $\hat{i}$ direction and $Y$ units in $\hat {j}$ direction ...
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Centrifugal Force & Rotating Frames [duplicate]

In Thornton & Marion's Classical Dynamics, the following relation is given for the rate of change of an objects position in the two coordinate systems (according to the picture shown at the bottom)...
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Cyclist leaning when rounding a bend [duplicate]

Why? Now here's the question that got me pondering A cyclist rounds a bend, The surface of the road is horizontal. The cyclist is forced to lean at an angle of $20^\circ$ to the vertical to 'only ...
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Could the moon's centrifugal force generate the same acceleration as 9.8 m/s$^2$? [closed]

If one dug into the moon, could one reach a point where the centrifugal force is close to that of Earth's gravitational pull? If so, how deep would one have to dig? If not, how close could one get to ...
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Can centrifugal force exist in non-Newtonian mechanics?

Judging on the fact that there are certain non-Newtonian fluids, that behave in a way adverse to Newtonian Mechanics, such as oobleck, is there a way for the idea of centrifugal force to exist outside ...
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Apparent discrepancy in Hamiltonian (energy) of particle in central potential system [duplicate]

The lagrangian is $$L =\frac{1}{2} m\left(\dot{r}^{2}+r^{2} \dot{\theta}^{2}\right)-V(r) \tag{1} $$ A constant of motion is $$ p_{\theta}=\frac{\partial L}{\partial \dot{\theta}}=m r^{2} \dot{\theta}=...
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Can a bullet travel all the way around a centrifuge?

I'm not planning to shoot any astronauts, but researching a problem for a story. Picture a rotating centrifuge in space, spun to generate artificial gravity, like so: https://media.wired.com/photos/...
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