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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 ...

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Roller coaster loop top speed

For a roller coaster loop, if it were perfectly circular, we would have a minimum speed of $v_{min} = \sqrt{gR}$ at the top of the loop where $g=9.8 m/s^2$ and $R$ is the radius of the 'circle'. ...
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Building a cool Fan [closed]

I am building a cool ceiling fan. Its going to have 3 blades with one master blade that is 6 ft. long, its center of rotation will be at 3 ft. obviously. On the to opposite ends of the master blade ...
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The change in magnitude of centripetal acceleration

When an object (e.g. racecar) moves around in circles with constant tangential velocity, constant centripetal acceleration is present. What happens to the centripetal acceleration when the racecar is ...
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Centripetal force and energy

I have a question related to centripetal force. Say there is a pendulum, then \begin{align} mg[h_{max} - h_{current}] = \frac{1}{2}mv^2 = \frac{1}{2}\ell F_{cp} \, . \end{align} Solving for ...
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Centrifuge Artificial Gravity?

I just saw the following video: NASA centrifuge. In video, a person is walking on a huge spinning centrifuge. But his weight is still acting downwards and there is no supporting force which will keep ...
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Is the normal force equal to weight if we take the rotation of Earth into account? [duplicate]

In my physics class we were doing problems such that we set $N$ (normal force) $= mg$. I understand that by Newton's Third Law, if I exert a force on the ground, then the ground will exert an equal ...
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Why does the vector in the banked turn problem not point to the center?

I am currently working on the banked turn problem. I know that once you set up all the equations properly you end up with $$v^2=gR\tan{\theta}$$ I drew a little diagramm of the forces: I know that ...
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Ball in a spinning disc

So imagine we have a disc at rest and a ball at the middle of its radius. Now the disc starts rotating with constant angular velocity. Where will the ball go? Will it remain at $R/2$? Watch this ...
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Vertical loop forces [duplicate]

So my buddy and I were playing roller coaster tycoon, and we were thinking about the physics behind a cart going around a loop. So we could think of the forces pretty easy for a loop on the x axis (...
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Do internal forces cause change in velocity?

For the earth sun system, the force of gravitation is an internal force ( forces* a newtons third law pair) and this INTERNAL force is causing the earth to accelerate. . it is providing the ...
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Tension in a stone, string system undergoing uniform circular motion [duplicate]

I've recently read that a string can be assumed to be a spring with a really high spring constant, and it applies a force in the opposite direction to the force being applied Like in this case, ...
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The radius of a body in circular motion

If the kinetic energy of an object in circular motion due to a gravitational force is given by: $$E_{kinetic} = \frac{GM_{object}M_{planet}}{2X_{radius}},$$ then why does radius decrease when ...
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Centripetal force and vertical motion

In regards to an object in vertical circular motion - such as a motorcycle going around a circular track, am I correct in saying that $F_\text{centripetal} \neq F_\text{net}$ ? Generally in school, we ...
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What is the distance from the Earth where the centripetal force would equal the gravitational force?

I've been trying to find the length of an unbendable and unbreakable tether of zero mass extending off the surface of the Earth with a mass at its end, where the centripetal force would equal the ...
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Banking of road

If a car is moving on a banked frictionless road one of the component of normal reaction force acts as the centripetal force required for the turn. But normal reaction force is a reaction force. ...
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Rotate bucket with and without water in vertical circular path -minimum velocity and tension in rope and normal force

Part A I am rotating an empty bucket in a vertical plane. Assume constant speed all throughout the circular path. The empty bucket weighs $Mb$ kg. The rope radius is say $R$ meters.What is the ...
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If every object could give an equal and opposite force to what we apply then why do the objects exhibit translatory and rotational motion? [duplicate]

If I push a block on a frictionless surface with enough force, it begins to move. Shouldn't it be standing still if it exerts an equal force on me as per 3rd law?
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A man on much faster spinning Earth decides to jump

Imagine that the Earth is spinning much faster than real situation and a man on the Earth's surface feels weightless. Suddenly the man decides to jump vertically with respect to the Earth. What will ...
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Object rotating in a circle without rope

An object is rotating in a vertical circle. There is no aid, ie no rope. So how does the object keep moving in the circle? Is it the normal force that provides the centripetal force? Also can friction ...
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Mathematical proof for the circular path of a charged particle moving with constant speed in a uniform magnetic field

I am trying to find the acceleration caused by magnetic field along the x and y axes so I can integrate and find the path equation, therefore I can prove mathematically that it is circular, but I can'...
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Centripetal Acceleration to find Orbital Velocity

When presented with a problem asking for the orbital velocity of an object $1,000 km$ above the Earth's surface, the formula I know you can use is $$v=\sqrt{\frac{G*m}{r}}$$ However, I was thinking ...
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Normal force in uniform circular motion [duplicate]

When we consider a person on a ferris wheel, the forces acting on him at the top are the normal force and gravity. The acceleration of the person is downward (towards the center), so by Newton's ...
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For an object in a rotating cylinder, is the normal force on that object equal to the centripetal force?

There is a vertical cylinder, an object is glued to the wall (verticle) of that cylinder. The cylinder starts rotating. Is the normal force, in this scenario, the centripetal force? I ask this ...
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Minimum Time Through Curve

Consider the following conditions: A level road with the path $\vec{r} = \left<x(s),\ y(s)\right>$ A max speed of $v_{max}$ A vehicle with the mass $m$ Tires with a static friction coefficient ...
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Centripetal Force on Springs

Please could someone provide an explanation for this. I thought that increased velocity would cause greater centripetal force (which, I think, acts towards the centre of curvature) so would the ...
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why is friction acting towards the centre in a level curved road? [duplicate]

We all know that friction is a force that opposes motion and is applied in the opposite direction of motion, but in a leveled curved road it becomes the centripetal force and pulls towards the center. ...
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Question about the Normal Force exerted by Planet Earth in relation to centripetal force

I have the following question based on a paragraph from my Physics textbook (I am translating, so the result might not be the most elegant): It states that due to the centripetal force resulting from ...
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Tethered ball - Centripetal force

I'm learning physics on Khan academy and i have stumbled upon a task that I cant completely understand and I'm a type of person that cant continue the studying until everything that I have read is ...
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Was Feynman right about the chalk in the spaceship?

I have heard this problem many times before from various sources, but I am quoting Feynman's words from his Lectures On Physics (Vol : 1) , just in case you want it to be authentic. Therefore, ...
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How to nullify effect of Centrifugal force/centripetal force

I have a track over which a rectangular object moves. The object holds sensitive material which should not move too much. Then there is a 90 degree turn of the track with some radius of curvature. ...
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What happens if the gravitational force on a satellite is greater than the centripetal force needed to keep it in circular motion?

Will the satellite continue to orbit the Earth, albeit not in a circle? Why? I would greatly appreciate it if someone could help me address this query. :) Also, I think someone asked a similar ...
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Gravitron Physics vs Spinning a ball in a glass

I have experimented with trying to "lift" up a ball inside a glass by spinning it. It works with a wine glass in which the top is narrower than the bottom but not with a vertical glass (I've used ...
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Centripetal force problem

Can someone please help me with this problem , I need an explanation not a solution to this problem. Ok so this task says: Car is driving with constant speed on on circular inclined twisted road. on ...
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Centripetal Force Not Include Force Needed To Oppose Weight?

In a question where a mass swings on a string, it asks at the the lowest point in the swing, what the centripetal force acting on the mass is? Now the answer it wants is gained just by filling in the ...
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Centripetal Acceleration Of Earth [closed]

Determine your centripetal acceleration due to rotation of the Earth. The geographical latitude of Toronto is $\Phi=43^{\circ}$. Radius of the Earth is $R=6.38\cdot 10^6$m. Textbook Answer: Why ...
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Water in a glass on a rotating disc

You put a glass of water on a record turntable and begin slowly increasing the speed. What happens first - does the glass slide off, tip over, or does the water splash out. I am particularly ...
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Wrong derivation of centripetal acceleration’s direction in uniform circular motion?

I will use the explanation in this site as an example of what looks to me as a wrong explanation of why acceleration in uniform circular motion is centripetal. This site, as other sources, reasons ...
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Geodesic equation as centripetal acceleration?

I was looking at the geodesic equation $$ \frac{d^2 x^\lambda}{dt^2}+\Gamma^{\lambda}_{\mu\nu}\frac{d x^\mu}{dt}\frac{d x^\nu}{dt}=0$$ and it occurred to me that it looks like the centripetal force ...
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Centripetal & centrifual force

we have a mass $m$ moving on the xy-Plane and we have the potential $U(x,y)=\frac{A}{2}(x^2+y^2) + B,\quad A,B>0$ with $A,B$ being constants. Now at $t=0$ we have $\vec{r}=(x_0,0), \quad \vec{v}=(...
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Centripetal & centrifugal forces [duplicate]

If there are no centrifugal forces in reality then how to explain weight loss due to rotation of earth or dynamic balancing of a rotating mass?
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1answer
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Finding the free body force diagram of this diagram

I am being asked to find the FBFD for the ball in this diagram the black weight on the horizontal rod is just there to prevent the ball from wobbling around when being rotated the arrows are meant to ...
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2answers
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How does centrifugal force count on the ball-rope problem?

I'm whirling a ball tying it by a rope. Then at any instant the centrifugal force (outward force) equalizes the centripetal force (inward force) . Then both should cancel each other and there should ...
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How do you calculate the distance from center for centripetal force equation for long objects such as board or a hammer?

I am trying to calculate the centripetal force for an enlongated object like a fan blade. Where do I measure to to get the distance from center. Would I measure from the center to the end of the ...
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1answer
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Conceptual Background for Banked Turn Problems?

I've read through the past posts on this topic and still am not finding an answer to this specific aspect. I get that in the "no friction" case, gravity pulls the car down on the track and the ...
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1answer
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Mass swinging in a horizontal circle

A mass of $100$ grams is tied to a $50 cm$ long string(secured to the ceiling). The mass swings around in an horizontal circle with a constant speed and it performs a quarter of circle every second. ...
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How is the centripetal force of a car when turning distributed over the wheels?

The centripetal force can easily be calculated as: $F = (M*v^2)/R = (M*v^2)*sin(\delta)/L$. But how is this force distributed over the (front and rear) wheels? My initial thought was to just divide it ...
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How is centrifugal force derived?

So far, I've understood the meaning and derivation of centripetal acceleration as $v²/r.$ Centrifugal force is therefore basically mass times the centripetal acceleration. But how exactly is the ...
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Kinetic Energy and Centripetal Force

I know since no work is done by the centripetal force, kinetic energy is constant; but does that mean it if the kinetic energy was increased or decreased it would have no effect on the centripetal ...
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How do we explain defying gravity by objects on the wall of a rotating drum?

Image courtesy: The calculus story: A mathematical adventure; David Acheson How is the static friction balancing the gravity which seems to be provided by the normal force of wall on people. I ...
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Clarify vectors at angles of 90 and 270 degrees from the vertical for motion in a vertical circle

I believe the expression for motion in a circle, measured at the top and bottom of that circle,is $\frac{mv^2}{r} = T - mg$ where $mg$ is negative because it acts downwards at all times. I am ...