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Questions tagged [centrifugal-force]

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Why does centrifugal force contribute to potential energy?

A ball of mass $m$ is moving inside a vertical hollow hoop with radius $L$ and with angular velocity $\omega$. I was asked to find a term for the total potential energy of the ball. I found the ...
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4answers
257 views

Can there be a fictitious centripetal force?

Can their be a radially inward inertial force? https://en.wikipedia.org/wiki/Centrifugal_force is says nothing on Wikipedia about this.
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Do centrifugal forces occur when the world around me is spinning but I am at rest?

So I understand that when you take, let's just say a plate, and you spin it, any objects on it would be "pulled" outwards (Because they want to follow a straight line rather than a circular one). But ...
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2answers
876 views

Why centrifugal force (not centripetal force) is considered while deriving the effect of rotation of Earth on “g”?

As I was trying to work out the expression for the apparent "g"-in case of the rotation of Earth-I was considering the centripetal force (m$w^2$r) and the weight (mg) all the time, thinking these were ...
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1answer
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Acceleration in plane polar coordinates [duplicate]

When we express acceleration in plane polar coordinates, we can find that $\vec{a}= \left(\ddot{r} - r \dot{\theta}^2\right)\hat{r} + \left(r \ddot{\theta}-2\dot{r}\dot{\theta}\right)\hat{\theta}$. ...
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1answer
349 views

Questions about the Gravitron ride and how centripetal force works

Hi just have a basic question. Just went to the local fair yesterday and road the Gravitron ride. The ride that sucks you to the walls. I became curious on the physics that cause you to get stuck to ...
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2answers
137 views

Turning a bike, why does it lean?

I realize this seems like a pretty simple issue of drawing a free body diagram, but I just can't seem to figure it out. If a bike leans, then it must have had a torque that made it lean. I ...
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2answers
579 views

Central force - stable/unstable circular orbit for $V = -V_0 \exp(-\lambda^2 r^2)$

This problem is from Introduction to Classical Mechanics With Problems and Solutions by David Morin. The solution is also given in the book for this particular problem. Problem #6.6.1 A ...
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2answers
694 views

Is it correct to say that different acceleration of free fall at the poles and equator is due to centripetal acceleration? [duplicate]

In one of the answers to this question I read that it was becsuse for an object experiencing circular motion at the equator, part of the gravitational force would have to provide for the centripetal ...
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2answers
149 views

Very simple mechanics question (pendulum) [closed]

Suppose there's a rigid rod, and at the end of the rod, there's a weight. If the rod (i.e "rigid pendulum") is rotating forming the shape of a cone, like this picture: (a) What would be the forces ...
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0answers
136 views

Why is a paraboloid surface formed with a rotated liquid? [duplicate]

I've read in Wikipedia that: "if a liquid is contained in a cylindrical vessel and is rotating around a vertical axis coinciding with the axis of the cylinder, the free surface will assume a ...
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1answer
728 views

Understanding the relation of the centripetal force's direction and the weight in a loop-the-loop

I am having difficulty understanding circular motion problems in an intuitive way - in particular, when an airplane is performing a loop-the-loop: Suppose an airplane performs a loop-the-loop, so ...
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2answers
63 views

Physics circular motion [duplicate]

Take for example the case of a rod rotating about an axis passing through its centre of mass and perpendicular to it. It has a ring hung from one of its sides. The rotation of the rod causes the ring ...
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1answer
309 views

How are the Lagrange points determined?

According to Hyper Physics, there are 5 equilibrium, or Lagrange points of the Earth-Moon system and only 2 of them are said to represent stable equilibrium points. This made me think if there is an ...
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2answers
225 views

Growth of pepperweed in a rotating reference frame [closed]

I currently have an exercise in my first physics semester that I don't think I can solve yet with which we have seen. Question is as follow: Pepperweed seed was planted near the rim of a horizontal ...
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1answer
465 views

Significance of centrifugal potential

While dealing with central forces (purely using newtonian mechanics) I've came across this result: $$U_\text{eff}(r)=\frac{l^2}{2\mu r^2}+ U(r) \, .$$ I'm not at all fluent with the lagrangian ...
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1answer
105 views

Planetary motion: with a different nature of potential. Condition for circular orbit

Consider a particle moving in the potential $U (r)= -A/r^n$, where $A>0$. What are the values of $n$ which admit stable circular orbits? I tried to solve by putting $dr/dt=0$ in the total energy ...
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2answers
180 views

Gravity and centrifugal force

Assuming the radius of Earth as $6.36\cdot10^6\:\mathrm m$. Then i get for the centrifugal force of an object with the mass of $m=10,000\:\mathrm{kg}$: $$r\cdot\omega^2 \cdot m = 6.36\:\mathrm m \...
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1answer
78 views

Centrifugal force observed from inertial frame

Suppose a ball is resting on a rotating disc ( rotating about an axis through its center ). For an observer sitting on the disc, the ball will move radially outward due to centrifugal force. A second ...
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1answer
101 views

What is the difference in Accleration at Gravity ocean vs mountain & poles vs equator

This topic is a struggle because my Professor made me rewrite my paper because she doesn't want forces included. Please help because I am struggling to understand this. I have googled and this is so ...
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2answers
173 views

Will the Earth flatten out?

Since the rotation of the earth makes it more flat,due to the centrifugal forces, is it not possible for the force to completely flatten out earth into a plane ?
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3answers
373 views

Why does a person in a satellite revolving the earth feel weightlessness? [duplicate]

We are taught that the centripetal force provided to the satellite by the earth's gravitational force gets equalized to the centrifugal force produced due to the inertia of direction of the orbiting ...
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1answer
149 views

Deformation of Earth caused by centrifugal force

The centrifugal force causes a distension at the equator. With a simple model we can estimate the dimension of this deformation ellipsoid. We start with a mass $m$ at the point $P$ on the surface of ...
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1answer
43 views

Motion of a person on the surface of Earth in absence of Earth's attraction [closed]

If the earth suddenly stops attracting objects near its surface, what will be the motion of a person on the surface of the earth? (neglect the effect of rotation of earth.) There are two possibilities:...
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1answer
298 views

Can heavy water be isolated with water centrifuges?

If a container of pure water is rotated fast enough at high rpm, would $\mathrm{D_2 O}$ separation be feasible? Another way to ask is: it practically and physically possible with current technology ...
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2answers
138 views

Stuck on relative angular motion and inertial forces

OK,before I start explaining my problem, let's consider this system - You have a particle rotating about the z-axis of an inertial frame of reference, with angular velocity $\omega$ with a radius $r$, ...
2
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0answers
248 views

Definition of effective potential energy in two-body central-force problems [duplicate]

The Lagrangian of the two-body problem in terms of polar coordinate $r$ and $\phi$ is $$\mathcal{L}=\frac{1}{2} \mu (\dot{r}^2+r^2\dot{\phi}^2)-U(r)$$ And the Lagrange equation corresponding to $\phi$ ...
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6answers
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How can the centripetal force lead to objects flying apart?

I don't understand how the centripetal force, which always points to the center of our circular motion can cause this scenario: We have a big stone which spins very fast, so fast that a part breaks ...
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1answer
79 views

Deriving the vertical displacement $y$ as a function of $t$ if we disturb a (stable) equilibrium of two opposing forces [closed]

I was thinking about a situation as I sketched above, somewhere in outer space. In this sketch, we see a mass $m$ attached to a red rope (considered massless). The mass makes a circular motion with ...
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2answers
252 views

What causes a particular object to have a tendency to go outwards in circular motion when the centripetal force is inwards to the center [duplicate]

Like a circular bead with a thread passing through it and the system being rotated . It can't be centrifugal force as it is pseudo only and has no existence when we are already in an inertial frame ...
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1answer
298 views

Various ways to relate Latitude and Acceleration due to Gravity

I was studying the effect of latitude on acceleration due to gravity. Note: Please note that in both the parts, the frame of reference chosen is the observer on Earth at that point. Part 1 I tried ...
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5answers
8k views

Does centrifugal force stiffen a rotating blade?

I'm a helicopter pilot with limited physics knowledge (units in BSc and HNCs). I have recently challenged an assertion that rotating blades are stiffened by centrifugal force. In My mind, stiffness ...
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1answer
87 views

Contradiction in my Lagrangian mechanics problem [duplicate]

The Lagrangian for a particle of mass $m$ in a potential well $V(r)$ is given by $$ L = \frac{1}{2}m(\dot{r}^2 +r^2\dot{\theta}^2) - V(r). $$ Working though the Euler-Lagrange equation I get $$\...
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1answer
7k views

Effect of Latitude /rotation of Earth on g

Okay,I am having a little problem in understanding the effect of latitude/rotation of Earth on g. In this figure, the test mass,m at place P experiences Centrifugal Force, Fcf acting outwards. As ...
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2answers
174 views

Gravitational/centrifugal effects felt in a space elevator

I understand that a space elevator should be at least as long as a geosynchronous orbit (22,236 mi), because only beyond that is the centrifugal force from the Earth's rotation is greater than the ...
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2answers
168 views

Artificial gravity through centrifugal force while traveling very fast in vacuum

So, if you've ever read a sci-fi book you've seen it before probably: a ship like "babylon 5" (or the ship in "2001 A space odyssey" ) which rotates and creates artificial "gravity" by using ...
2
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1answer
69 views

Would the centrifugal effect of the Earth orbiting around the sun cause the weight of an object to change?

If you weighed an object at mid day and then again at midnight, would the objects weight change ( ever so slightly ) due to the centrifugal effect of the earth travelling around the sun ? What I am ...
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1answer
277 views

Centrifugal force intuitive explanation [duplicate]

I would like to know if centrifugal force is only apparent why all the objects in a washing macchine are pressed against the "wall"? I can experience the effects of the centrifugal force even if I am ...
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1answer
325 views

Centrifugal force and centrifugal pump

A rotating stone flys off tangentially when we cut the string and not radially. So how does centrifugal force "throw" the fluid outward (i.e radially) in case of centrifugal pumps? Also please explain ...
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2answers
588 views

Why does a marble in a merry-go-round move towards the edge? [duplicate]

When the marble is viewed from with respect to the ground, it experiences a net inward acceleration, and hence force. However, when the marble is displaced slightly, it moves towards the edge. Why? My ...
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1answer
50 views

How does the force change with distance in a centrifuge?

If there are two centrifuges spinning at the same speed but one has twice the radius of the other, the contents of which centrifuge will be forced against the outside wall the most? Or to paraphrase,...
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1answer
78 views

Why does the clothes leave water when twisted or swirled?

When we wash clothes and are drying them why we swirl or twist them to remove water i mean anything could have happened but the water leaves out of the cloth.
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1answer
370 views

Difference between Motorcycle and road bike max lean angle

I've wondered why motorcycles can lean harder into turns than road bikes. I've went through the formulas and the only different variable I've found was tire traction. Is that really so? To me it does ...
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1answer
240 views

How is Centripetal Force related to rotation about one of the Principal Axes of Inertia of a rigid body? [closed]

Here I have understood the solution but just have a doubt regarding the last question about the vector force at B. The solution says that as the y axis is a principal axis of inertia,so rotation ...
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2answers
2k views

Centrifugal force on a merry-go-round

I'm having trouble understanding centrifugal force, so I would be glad if someone could explain it to me. From what I've read, centrifugal force is a fictitious force, directed radially outwards, ...
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1answer
263 views

Artificial gravity in a spinning space station

I have a question about artificial gravity in a spinning space station. From astro.cornell.edu: In space, it is possible to create "artificial gravity" by spinning your spacecraft or space station....
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4answers
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Why do non-rigid bodies try to increase their moment of inertia?

I have oft noticed that a non-rigid body on being rotated tries to increase its moment of inertia. Is there any way we can prove this in a logical and mathematical fashion?
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1answer
104 views

What mass distribution around a huge rotating cylinder would a person (who can't see the outside) at rest on the inner side of the cylinder infer?

In a rotating frame, the artificial gravity has a peculiar form. At the center, this "gravity" is zero, while it's increasing in proportion to $R^2$, where $R$ is the distance to the center. Now ...
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1answer
102 views

Why does stress decrease as you move away from the rotational center?

A while ago Real Engineering posted a video "Can we create artificial gravity". During the video he states that the designers of Elysium took note of the centrifugal and centripetal forces acting on ...
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1answer
75 views

Would an object floating in a spinning cylinder in empty space be pushed toward the wall of the cylinder? [duplicate]

This is a rather simple question, but it intrigues me nonetheless... If there was a ball in a hollow cylinder that was spinning (on an axis) in empty space (no noticeable gravitational effects), and ...