Centripetal force Definition and 562 Threads

Is the movement of winds due to coriolis or centripetal force? Or is there no way to tell, like for example for tidal forces, there is no way to tell wether they are caused by centripetal forces or gravity. (At least that is how I have understood the problem.) Earth is like a huge turntable...

Hi everyone, Maybe it could be an idiot question but I've never know why. If centripetal force points to the center, Why a car making a turn tend to skid to away of the road? I mean, there would have to be a force opposite to centripetal, that is in fact, greater than it, for the...

I assume this is the correct forum for this question... :P This is the idea: we have a hollow object (probably a sphere or cylinder), attached to a tether, rotating around a central body. The dimensions and speed I don't have specifics for and shouldn't matter: the point is, centripetal force...

Hi, I got 2 questions concerning Centripetal force. I am thankful for every answer I get ! 1) Let's say a car is driving very fast in a loop with radius r on Earth where air resistance and friction doesn't exist. Let's say the car's engine stops and when the car gets to the top of the loop...

Homework Statement I have a graph with the radius on the x-axis and Fc on the y axis. I had to then calculate the slope of this linear relationship. I did that, and I got 0.17. The problem is that I don't know what this represents. mass? acceleration?? Homework Equations Fc = m4π^2rf^2...

Hi For a car making a turn, the friction between the tires causes the centripetal force, but how come in FBD I always see the centripetal force being drawn acting on the center of mass and not the point of contact between the wheels and the ground? Similarly, if I was dragging a pick of...

Hi everyone. I've seen this question posted before so I apologize, but I have a hard time understanding the responses and some posts in different threads seem to go different directions (I don't know what to follow!). I've given the problem a try and would greatly appreciate knowing if I'm on...

I need help with calculating the centripetal force of a trebuchet. I have tried to derive an equation from a free body diagram, but I am sure that I'm doing something wrong. Does anyone know how to calculate the centripetal force?

If for example someone is walking along a radial line of a spinning disc at constant velocity would they experience a different centripetal force than if they were standing still at that particular location (I know the person would experience jerk while moving along, but would they experience a...

The situation is like this, You're holding a string with a rock at the end of it. You hold the string above your head and whirl the string. It's going to make an angle with the vertical, so its not 90 degrees. So if I break it into components, Ft (tension) * cosX will be the vertical...

Homework Statement If a satellite drops to a lower orbit, how does this affect its centripetal force, period, tangential speed, and angular velocity? Homework Equations Fc=m(v2/r) The Attempt at a Solution Because of the formula above, the satellite experiences an increase in Fc...

Homework Statement In a lab, we essentially used an apparatus similar to this: In three experiments with several trials, we varied three things: centripetal force (the mass of the bottom), radius (of the circle by adjusting the alligator clip), and mass (rubber stopper). The trials were...

Homework Statement A wet towel, of mass 0.65 kg, travels in a horizontal circle of radius 26cm in the spin cycle of a washing machine. The frequency of rotation is 4.6Hz. a)Name the force causing the centripetal acceleration. What object exerts that force? b) What is the speed of the...

Hello, I am currently studying circular motion, and I would like to know if the statements I have made below are correct. -------------------------------------------------------------------------------------------------------------------------- The centripetal force is the sum of all...

Homework Statement I did an expirement in my physics lab on centripetal force. I'm doing the calculations and right now I am calculating the centripetal force using equation: F= (mass)(angular speed squared)(average radius). My answers are coming out to be huge numbers. ex: (148.8g)(52.70...

Hello everyone I know my question might be strange and stupid but I have to ask it! When an object attached to a string and moved in a horizontal uniform circular motion, the tension of the string will point to the center of the circular motion, right? Well, I can't see why! I know that the...

The last post in the thread https://www.physicsforums.com/showthread.php?t=466305 seems to say that the relativistic force on a mass moving on a circular path is the centripetal acceleration, v*v/r, times rest mass times gamma squared. But the articles...

Homework Statement You are playing with a yo-yo with a mass of 225 g. The full length of the string is 1.2 m. You decide to see how slowly you can swing it in a vertical circle while keeping the string fully extended, even when the yo-yo is at the top of its swing. (a) Calculate the minimum...

First, please forgive my ignorance, as I do not really know enough to ask this question properly. In the carnival ride, Barrel of Fun, the centripetal force holds you against the wall of the barrel while it spins. As anyone who has ridden this ride knows, you can feel the force holding you...

Homework Statement Question 1: What speed must a satellite have to orbit the Earth at a distance 7.8 x 10^7 m/s from the Earth's centre, where the acceleration due to gravity is 0.065 m/s^2? Question 2: An object orbits the Earth at a constant speed in a circle of radius 6.38 x 10^6 m...

Homework Statement Here is a diagram: http://i55.tinypic.com/k18g14.jpg A ball of mass 0.75 kg on the end of a cord is swung in a circle of radius 1.5 m with a period of 1.5 s as shown in the diagram. a.) What is the speed of the ball? b.) What is the acceleration of the ball? c.) What...

Homework Statement Assume that the driver of a car begins to brake his car when the distance from his car to a wall is 107 m. The mass of his car is 1400 kg, and its initial speed prior to braking is 35 m/s. The coefficient of static friction is 0.50, and assume that the car's weight is...

Homework Statement A roller coaster car has a mass of 1200 kg when loaded with passengers. As the car passes over the top of the circular hill of radius 18 m, its speed is not changing. What are the magnitude of the normal force and the direction of that normal force with the below conditions...

as you all know the equation for centripetal force is (m((2 pie r)/t)^2)/r). ok so imagine this. a weight attached to a string attached to a pivot point. the weight is rotating around the pivot point. the pivot point can move back and forth along the x axis. if looking at a x, y graph. the pivot...

Homework Statement A popular amusement ride operates as follows: Riders enter the cylindrical structure when its stationary with the floor. They then stand against the wall as the cylinder then begins to rotate. When it is up to speed, the floor is lowered, leaving the riders suspended against...

A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? g downward g upward 0.5 g downward 2 g upward...

Homework Statement While 2 astronauts were on the surface of the moon, a third astronaut orbited the moon. Assume the orbit to be circular and 100km above the surface of the moon. If the mass and radius of the moon at 7.40x10^22kg and 1.70x10^6m respectively, determine (a) the orbiting...

is there centripetal force in a semicircle?

We did a experiment, and the aim was to find out that relationship between mass and radius with period of time in the circular motion..Although I know the formula for centripetal force, but I am not sure about what the expression should be The lab data : Table 1: 1st experiment ...

I read in the jearl walker's fundamentals of physics,that the centripetal force for a car moving in a curved road,is static friction.But as we now static friction is the result of another force and can't be existed alone.what is the force causing this friction? thanks

Homework Statement I did a lab where there was a glass tube with a rubber ball attached and a string hanging from the glass tube with metal washers attached at the bottom. My question is if the ball were to hang too low why would the centripetal force be less accurate is it because there...

Homework Statement A small block of mass m = 5kg slides along the frictionless loop-the-loop track shown in the figure. R = 2m a) If it starts from rest at P, what is the resultant centripetal force acting on it at Q? b) At what height from the bottom of the loop should the block be...

Homework Statement prob1) For a car traveling with a speed v around a curve of radius r, determine a formula for the angle at which a road should be banked so that no friction is required. prob2)Calculate the frictional force needed for a 900kg car traveling around a 500m radius curve at...

Homework Statement So I'm doing a lab of examining circular motion and centripetal force. My results came out to be that as Fg increases, Fc decreases. My question is if this relationship between Fg and Fc is logical and why? The experiment was conducted in a way that a ball was attached to a...

1. In a certain binary-star system, each star has the a mass of 1.36e30 kg, and they revolve about their center of mass. The distance between them is 1.1e8 km. What is their period of revolution in Earth years? 2. gravity = centripetal force (g*m*m)/d^2 = (mv^2)/r 3. I've tried plugging in...

Considering Earth spins there is a centripetal force acting on us. How much force is acting on us? Say a 1Kg weight? Can someone give me an equation? Is it significant? I was wondering if land racer would be noticeably lighter or heavier if traveling in one direction or another at 700mph due to...

Homework Statement A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of a. The car makes it one quarter of the way around the circle before it skids off the track. From these data, determine the coefficient of static friction...

Homework Statement You have been asked to design a roller coaster track with a circular vertical loop in it. The loop is to have a radius of 10.0 m. How fast would the roller coaster have to be traveling so that at the bottom of the loop, the passengers will feel as if the seats are pressing...

First of all, the situation is as follows : A girl is swinging a bucket filled with water, and she is whirling it around in a vertical motion. When the bucket is at any other position on the circumference of the circle, everything seems fine and intuitive. But an interesting thing...

Homework Statement A roller coaster goes through an inside vertical loop at the minimum speed required to just barely make it through the top of the vertical track. At the very top of the track, the magnitude of the centripetal force acting on the 'coaster is a. mg. b. 2 mg. c. 6 mg. d...

Homework Statement I'm having a hard problem conceptualizing this. It states that an object with a certain Mass M is being spun in a vertical circle. The object attached to a rope, and the object moving in circular path with constant radius. It also give you the velocity of the object. It asks...

Homework Statement A 2500 kg car starts from rest and travels along a circular track with a radius of 55.0 meters. The car starts out at a position due East of the center of the track, heading due North initially around the track, which is counterclockwise. The car increases its speed by 105...

Homework Statement There is a loop-the-loop, thing, and a dude on a bicycle is going to ride around the loop. Total mass is 1 kg (I'm aware that isn't realistic at all...) and radius is 10 meters. a) what is the minimum speed that the cyclist must have to make it over the top of the loop...

Homework Statement Hi. I have this problem: A particle of mass m, rests on top of a frictionless sphere of radius R. Admitting that part from the rest for the position indicated in the figure along a path contained in a vertical plane. Get the value of the angular coordinate at the instant...

Homework Statement A 2.1 kg mass is connected to a spring with spring constant k=150 N/m and unstretched length 0.18 m. The pair are mounted on a frictionless air table, with the free end of the spring attached to a frictionless pivot. The mass is set into circular motion at 1.4 m/s. Find...

Homework Statement When a car is speeding over a curved surface e.g a bridge, it sometimes loses contact with the ground. We have seen this many times in high speed chases and rally driving. In this scenario, the textbook wrote this equation: S-mg =Mv^2/r The RHS side is obviously the...

Homework Statement I)The mass of the moon is 7.35*10^22 kg. In inertial coordinates, the moon orbits the Earth in 27.3 days at an average distance of 3.84*10^5 kg. Calculate the centripetal force on the moon. II)The mass of the moon is .0123 times that of earth. Since the Earth is...

Homework Statement A 25 kg child is on a swing, which has a radius of 2.00 m. If the child is moving 4.0 m/s at the bottom of one swing, what is the centripetal force exerted by the ropes of the swing on the child? What is the total force exerted by the ropes when the swing is at its lowest...

Homework Statement A 55.5 kg ice skater is moving at 4.02 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.807 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this...

A highway curves to the left with radius of curvature R = 46 m. The highway’s surface is banked at θ = 26 so that the cars can take this curve at higher speeds. Consider a car of mass 1018 kg whose tires have static friction coefficient µ = 0.57 against the pavement. The acceleration...