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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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Why do objects in circular motion move outwards instead of inwards? [duplicate]

I know that whenever an object undergoes circular motion then it has a centripetal acceleration towards the centre and a tangential acceleration. Due to these accelerations I had thought that ab ...
Madly_Maths's user avatar
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Getting an opposite sign for the centrifugal potential energy in the effective potential [duplicate]

Consider a system whose Lagrangian is $$L = \frac12 \mu\left( \dot r^2 + r^2 \dot\theta^2 \right) -U(r) $$ By the Euler-Lagrange equation, $$\frac{\partial L}{\partial\theta}=\frac{d}{dt}\frac{\...
xiver77's user avatar
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Why doesn't centrifugal force change instantly?

If I'm riding my dirt bike on a rocky road, centrifugal force keeps the front wheel rolling in a straight line so I can take my hands off the handlebars without worry. But if I hit a rock and the ...
foolishmuse's user avatar
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4 votes
4 answers
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What is the relationship between gravitation, centripetal and centrifugal force on the Earth?

I'm trying to analyze a situation wherein a ship is moving across the surface of the earth. I am trying to analyze this situation in a reference frame that is rotating with the earth (NED frame). I am ...
john morrison's user avatar
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1 answer
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Why, when we calculate forces in banking of roads, we do not take the centripetal force but the centrifugal force?

I know the we only apply centrifugal force when in non inertial frame of the object but in banking of road questions, why cant we make equations from inertial frame rather than non inertial frame? ...
Gaurav Batra's user avatar
1 vote
1 answer
60 views

Question on rotational dynamics

My book states that it's convienient to apply torque equation $\tau=I \alpha$ on instantaneous axis of rotation and centre of mass. My question is: why it is so? And how can we apply torque equation ...
NAITIK VERMA's user avatar
1 vote
1 answer
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Drawing a free-body diagram for a body residing on Lagrange point $L_4$ and $L_5$

I am aware of the fact that Lagrange points $L_4$ and $L_5$ are stable equilibrium points however I cannot understand why they are equilibrium points in the first place. Consider a Earth-Moon system ...
John Davies's user avatar
-1 votes
1 answer
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Forces in tangentially-accelerating circular motion

Let's say a car is moving along a semicircular path. It moves with constant speed for the first half. Then, it accelerates with constant tangential acceleration for the second half of the semicircle. ...
Aliki G.'s user avatar
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1 answer
62 views

Apparent contradiction regarding centrifugal force

Consider an inertial reference frame $I$, and a point object $K$ which is at rest with respect to $I$. $K$ is not at the origin of $I$. Consider another reference frame $I’$, with the same origin as $...
Soham Saha's user avatar
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2 answers
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Why is the centrifugal force multiplied by $\sin$ here?

I'm currently studying for an exam and wondering what the visual interpretation of this question would be. It's a multiple part question and the first question was describing the equilibrium angle of ...
Thabuu X's user avatar
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1 answer
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How does $g$-force work?

I am attempting to correct a previous, unclear question. I was doing an assignment on rollercoasters and it stated that $g$-force was a major part of rollercoaster safety. It also related $g$-force to ...
user386598's user avatar
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1 answer
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Can we treat the entire mass of the spheroid as being concentrated at its center?

I know that to find the gravitational force between two objects, if either of them is a sphere, we can assume its mass to be concentrated at its center and use the formula for gravitational forces for ...
Peter swift's user avatar
4 votes
5 answers
260 views

How is Gravity, assuming only General Relativity, *not* like Centrifugal Force?

It is common to state that "Gravity is not a force" due to its interpretation as a curvature effect in general relativity. By this, is it right to say that gravity is a fictitious force due ...
Anthony Khodanian's user avatar
1 vote
1 answer
46 views

Normal force and when does it cancel out

If i have this box, making a turn and there is tennis ball inside, then how in terms of forces can the tennis ball stay how i drew it, all the way around the circle? What provides the centripetal ...
Safa yousif's user avatar
3 votes
2 answers
290 views

Normal force in a hypothetical rotating space station with artificial gravity

In order to simulate gravity on hypothetical space stations, one approach involves rotating the space station so that a centripetal force is present. Occupants within the space station's frame of ...
user12277's user avatar
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What is the net force acting on an object in circular motion?

For a particle in circular motion about a point due to a central force, is it correct to say that "net force on the particle is 0"? Obviously there is a force on the particle defined by the ...
SHINU_MADE's user avatar
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0 answers
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Shape of rotating celestial body in general relativity

It is know from hydrostatic equilibrium and Newton mechanic that rotating celestial bodies have a shape of oblate spheroids and this is confirmed by observations of Sun, Earth, etc. But I wonder what ...
user13964273's user avatar
4 votes
7 answers
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Would objects really be at rest relative to each other in orbit?

I am currently reading Gravitation by Misner, Thorne, and Wheeler (MTW). In the very first chapter on weightlessness they make the following claim: “Contemplate the interior of a spaceship and a key, ...
Nethesis's user avatar
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3 votes
4 answers
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G force roundabout question

If I'm driving and I want clear a roundabout as fast as possible, but I only can take so much G force before dying, do I drive in the inner or outer lane. Assuming that the maximum G force I can take ...
MiaLee's user avatar
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1 answer
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What is the hydrostatic shape of an ideal rotating planet? [duplicate]

It is a well-known fact that rotating planets have a flattened spheroidal shape. However, the NASA site says about Haumea: The fast spin distorts Haumea's shape, making this dwarf planet look like a ...
user27542's user avatar
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5 votes
1 answer
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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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1 vote
2 answers
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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
0 votes
0 answers
44 views

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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2 answers
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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
81 views

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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1 answer
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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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2 answers
79 views

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
83 views

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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2 answers
178 views

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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1 answer
48 views

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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-1 votes
3 answers
105 views

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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1 vote
2 answers
130 views

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 $F = -dV/dr$, ...
Stallmp's user avatar
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2 answers
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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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0 votes
3 answers
65 views

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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1 vote
1 answer
152 views

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
1 vote
0 answers
54 views

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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4 votes
5 answers
2k views

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 ...
22flower's user avatar
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1 vote
0 answers
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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
0 votes
1 answer
81 views

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
59 views

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
39 views

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
144 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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0 votes
1 answer
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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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1 answer
60 views

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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2 answers
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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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1 vote
2 answers
52 views

${}$ 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
513 views

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 ...
bananenheld's user avatar
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0 votes
0 answers
172 views

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
80 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

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