# 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 ...
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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{\...
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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 ...
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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 ...
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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? ...
1 vote
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### 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 ...
1 vote
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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 ...
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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. ...
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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 ...
1 vote
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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 ...
1 vote
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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 ...
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### 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 ...
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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 ...
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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?
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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 ...
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1 vote
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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 ...
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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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