# Questions tagged [centripetal-force]

any force responsible for maintaining an object on a curved path around a fixed center. In introductory coursework this is usually "uniform circular motion" and yields several simple and useful relations. Not to be confused with the centrifugal pseudo-force experienced in an accelerated referenced frame.

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### Why is there a limiting value of friction (to avoid slipping) when driving in a circle

When thinking about this in reality and using equations I come to different conclusions. Using F = mv^2/r In reality I know that if the speed is too fast the car will not be able to go around the ...
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### i've been told that a motor bike can turn on a frictionless horizontal surface by leaning towards the horizontal

their reasoning was that when the bike lean towards horizontal the reaction acting on the bike by surface will act in an angle through the center of gravity of the slanted bike(not perpendicular to ...
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### When the static friction is the centripetal force, what is the opposite force?

Consider a circular horizontal plane (like a round tabletop) rotating around its center. Consider a body A resting on this tabletop. Since the tabletop is rotating around its center, the body is ...
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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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### Direction of change in Velocity Vector in Uniform Circular Motion [closed]

This is a snap of a textbook while describing Uniform Circular Motion. For all the diagrams, and by the vector law, the directions of the del(v) vector is perfectly fine. But I am confused why this ...
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### Does a vehicle turning on a banked road need to turn its wheels?

A vehicle drives in a circle on a track at constant speed at with radius of curvature $\rho$. The vehicle's acceleration is $$a = \upsilon' T + \kappa (\upsilon)^2 N \\ = \kappa (\upsilon)^2 N.$$ The ...
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### How can a body rotate with no forces acting on it?

Can a body being acted upon by no force in free space keep rotating, given it was initially rotating? I feel like it can, however then where does the centripetal force come from? Am I right in ...
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 ...
1 vote
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### 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 ...
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### Centripetal force on electron moving through curved wire [duplicate]

Suppose we have a curved ohmic conductor in the form of a circular arc with some thickness say $d$. Now, say we apply a potential difference across the two ends of the conductor. The electrons will ...
1 vote
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### Breaking component of centripetal force [closed]

I recently learned that we always break components of force along and perp to direction of net acceleration (for simplification) So in problems involving circular motion.... We resolve forces along ...
1 vote
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### Tension, Centripetal force and Simple-Pendulum

At position 3 We've to find tension in the string (ideal). The answer is: $$T = mg\cos\theta$$ But my doubt is, how can Tension at 3 balance the radial component of gravity. If that were so the ...
1 vote
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### Uniform circular motion, question on deriving the formula for the magnitude of the acceleration

I'm reading Halliday, Resnick and Walker's Fundamentals of Physics and I am a little bit confused about something in the section on uniform circular motion(Chapter 4-5). I get all messed up on if they ...
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### How did Ross Chastain's 'wallride' allow him to pass his opponents?

There's a clip going around on the internet of the driver Ross Chastain, 'wall riding' in a race that allowed him to pass many opponents on one turn. Here is the clip. What I do not understand is how ...
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### Where does the centripetal come from, in a cyclone?

It needs a tremendous amount of impulse ($Force\times time$) to keep the large mass of air and water vapor spinning for several days. Where does the sustained force come from? The centripetal force in ...
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### Why speed constant in uniform circular motion? [duplicate]

In a uniform circular motion(earth orbiting the sun as an example), we say speed doesn't change. If we take any moment, the force is perpendicular to the velocity direction. The object was moving in ...
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### How to calculate object displacement due to centripetal force of moving ball inside it?

Please note that I have little background in Physics and math and after searching for over a month I couldn't find anything that relates to what I am looking for so turning to Stackexchange for some ...
1 vote
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### How high do the balls on a Centrifugal Governor lift?

Suppose you have one of these Centrifugal Governours or a similar object. How to calculate the height that these balls have when the construct is spinning at a given speed?
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### Work done by centrifugal force brings energy conservation violation? [closed]

The rotating body with ${m}_1$ mass rotates with angular speed ${\omega}_a$, with a $r$ distance from the center of rotation. The rotating body is kept in orbit by means of a rope which is considered ...
1 vote
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### Centripetal force on the surface of earth

Initially, I was looking for how centripetal force is produced on the surface of the rotating earth for a mass kept at any latitude. I went through the following threads - Which force provides the ...
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### Where does the centripetal force point to in case the rotation happens on inclined surface?

I know that the centripetal force of an object points towards the centre of rotation of the object. But lets say I have a ball moving inside a cone in a fixed circular path. Where is the centripetal ...
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### Mass travelling with constant speed in a circle

Imagine a 2D circle has a point mass traveling along its circumference with constant speed. The only force experienced is centripetal. However, if we take the 2D plane the circle sits on and rotate it ...
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### What forces are responsible for the circular motion of the center of mass of a gyroscope-like setup in precession?

Suppose we have a disk (of mass $M$) connected to a rod (of mass $m$) attached to a fixed pivot. (Note that initially I thought of the rod hanging off a rope, but I realized it would be better to ...
1 vote
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### What torques or acceleration is required to move a differential drive robot on a circular path?

When a differential drive robot moves on a circular arc with constant speed, its kinematics gets me constant wheel velocities. This appears to suggest that once a circular motion is reached and ...
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### Confusion as acceleration seen from different angles disagree with each other

Heres the question: Find the tension in the chord when the balls height above the lowest position is $\frac{1}{2}L$. Answer should be in terms of $g$ and $m$. The solutions manual decided to orient ...
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### Centripetal Force on a ball kept on a rotating disc

Suppose I keep a ball some distance $r$ away from the centre of a rotating disc. Let's assume I keep the ball gently and slowly so as to not impart any velocity to the ball. If the disc were to be ...
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### Friction on a Spinning Platform

I do not understand at all why, if an object is sitting on a spinning platform, the friction force is towards the center. I understand the need for a centripetal force during circular motion, but ...
1 vote
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### Unexplainable discrepancy between the centripetal force calculated directly and by linear regression

The centripetal force $F_C$ of a uniform circular motion can be expressed as, $$F_C=\frac{4\pi^2mr}{T^2}$$ where $m$ is mass, $r$ is the radius, and $T$ is the time interval for one revolution (the ...
1 vote
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### Centripetal force on a rotating bead

Imagine a bead that is fixed on one end of a rod, the other end of the rod is free to rotate about a pivot. If someone taps on the bead, then the bead will start to rotate about the pivot point. There ...
1 vote
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### How would centripetal and centrifugal forces vary in a rotating rod?

Suppose a horizontal rod (ignore gravity) of mass $m$ and length $L$ is rotating about one of its ends with constant angular velocity $ω$. Then, the tension must decrease as we move away from the axis....
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### How to calculate the centripetal force along a cartesian axis?

If a centrifuge without a ballast is centered on the origin of an $x$-$y$ coordinate plane, and starts at the $x$-axis rotating with increasing velocity counter-clockwise around the origin, how can ...
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### Force applied on edge of a cylinder due to water

We take a horizontal cylinder of length $L$ and fill it with incompressible water of mass $m$ and close the two ends with lids. If we start rotating the cylinder with respect to one of the ends,the ...
1 vote
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### In frictionless banking, how can the normal force $N$ be greater than the weight force $mg$ if the car is not accelerating upwards? [closed]

Based on my understanding in frictionless banking, the vertical component of the normal force must be equal to weight force for the horizontal component be the centripetal force. This means that the ...
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### The use of centrifugal force in highschool physics classes [closed]

I am a retired theoretical physicist in the Netherlands. I am currently trying to promote the exact sciences by helping highschool students with their mathematics, physics and chemistry studies. I am ...
1 vote
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### Does friction help a car travel faster for a given radius on a banked track?

I was trying to do this question and my original attempt went like this: I see that my mistake was that I assumed that after friction is accounted for, the car will be pulled down into the same lane ...
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### If centripetal acceleration is pointed radially inward and it has a value $Ac = v^2/r$ is there not a value for centripetal velocity?

In uniform circular motion, an object is said to move tangentially along a circular path with a changing tangential velocity but a constant tangential speed. The velocity changes because the direction ...
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### Initial velocity needed for mass to make a full circle? [closed]

So, I was watching a video by Michele van Biezen and I stumbled upon an interesting problem. So the problem goes like this :"We have a mass $m$ that is hanging at the lowest point and is given ...
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### How is friction force calculated when the points of contact are on different surfaces?

(Edited question, 07/04/23) For someone standing on a carousel, there is a frictional force at their feet of magnitude $|F| \leq \mu N = \mu mg$ that is directed towards the centre of the carousel, ...
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### Why do we still use pseudo forces? [duplicate]

So when I was reading about Newton's laws, and my textbook (Sears and Zemansky's University Physics) gave the classic examples of when we might be tempted to create an additional "centrifugal ...
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### Coriolis force on a person on a carousel

Good afternoon all, I am looking at the question Running backwards on a carousel from 2020 and the accepted answer given below it. Why is there no centripetal force on the person in either reference ...
1 vote
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### Confusion regarding net acceleration of the bob in the bottommost point of the trajectory of a pendulum?

Here is my analysis from the inertial frame on it: At the bottom most point, $g$ acting downwards $v^2/r$ (centripetal acceleration) acting upwards So the net acceleration, a = $(v^2/r)-g$ right? ...
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### Intuition on centripetal acceleration

When analyzing centripetal motion, it comes to mind that the motion is caused by some central force that constantly pulls on a rotating body. This force naturally causes acceleration towards the ...
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### Why does the radius of orbit increase when a satellite increases it's velocity?

Can someone please explain to me why increasing the velocity of a satellite with a rocket booster will change the radius of the orbit rather than the linear velocity of the satellite? If the angular ...
1 vote
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### Forces on someone flying off a carousel

Good afternoon all, I'm trying to model a physics problem and would greatly appreciate some help. The situation that I'm looking at involves a person on a carousel, and the angular velocity required ...
1 vote
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### Is it possible for friction to be the sole provider of centripetal force?

Imagine a rough turn table with a wooden block (let it have negligible dimensions for the sake of simplicity) on it. The turn table is perfectly horizontal and is rotating with a constant angular ...
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### How can we use Newton's laws in an accelerating frame? [duplicate]

This question is bothering me for a while. As far as I know, newton's laws are valid for any inertial or non-accelerating frame. Then how can we apply newton's law on earth where we are constantly ...
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### Is Our actual weight $mg$?

As We are moving in a circle in uniform velocity, so the centripetal force acting on us should be $$F_{net}= \frac {mv^2}{R} =\frac {4\pi^2mR}{T^2}.$$ There are only two forces acting on us. The ...
1 vote
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### Relationship Between Velocity at Lowest Position and Gravitational Acceleration in Pendulum Motion

To my knowledge there are two methods of finding this relationship. One with the centripetal force and the other with conservation of energy. I've left my work in the image below. The problem here is ...