What is Centripetal force: Definition and 561 Discussions
A centripetal force (from Latin centrum, "center" and petere, "to seek") is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path. Isaac Newton described it as "a force by which bodies are drawn or impelled, or in any way tend, towards a point as to a centre". In Newtonian mechanics, gravity provides the centripetal force causing astronomical orbits.
One common example involving centripetal force is the case in which a body moves with uniform speed along a circular path. The centripetal force is directed at right angles to the motion and also along the radius towards the centre of the circular path. The mathematical description was derived in 1659 by the Dutch physicist Christiaan Huygens.
Centripetal Force / Tension / Speed (HELP!)
Homework Statement
A 100 g bead is free to slide along an 80 cm long piece of string ABC. The ends of the string are attached to a vertical pole at A and C, which are 40 cm apart. When the pole is rotated about its axis, AB becomes horizontal...
I make industrial fans of which use impellers that can reach up to 80 m/s tip speed, i also learned that it shouldn't be tip speed but tip acceleration because the impeller is constantly changing direction it should be 80 m/s^2.
So to calculate the force should i use force = Ma or m x...
Homework Statement
The moon takes 27.3 days to circle Earth and its centre is located 3.84 x 108 m from the centre of Earth. What is the Moon’s acceleration?
Homework Equations
a=v^2/r, a=4(pi)^2mr/T^2
The Attempt at a Solution
i don't know how to answer this question becuase i...
Homework Statement
A 1.00 x10^3 kg car is moving through a flat curve on a road at a velocity of 30.0 m/s. If the coefficient of friction between the road and the tires is 0.600, the radius of the curve is
Homework Equations
r=v^2/(coefficitent of friction)(g), r=mv^2/F
The Attempt...
What I'm trying to get at is this, can a spinning framework of rings build enough centripetal force to keep a mass of liquid at the centre of the frame work? And if so what would be the relationship and conditions that would have to be met?
Really need help:|
I need to find a relationship between the centripetal force and frequency of horizontal circular motion, and then find the theoretical gradient of the graph between log(frequency) vs. log(centripetal force). The radius of the string used was constant at 60cm.
I think that f = k^Fc where k is...
"A 0.400-kg pendulum bob passes through the lowest part of its path at a speed of 3.00 m/s.
What is the tension in the pendulum cable at this point of the pendulum is .8 meters long?"
I would like to ask for some help on understanding centripetal force in this particular situation. I realize...
My textbook says that the requisite centripetal force for the circular motion of a vehicle is provided by friction. I don't get that .... i mean , shouldn't friction oppose relative motion ...so , seeing as the direction of motion of the car is along the tangent to the curve , shouldn't friction...
A ball is swung around in a vertical circle at constant speed. Where is the ball when the tension in the rope is at maximum / minimum?
I know where the ball is, how would I explain it?
Homework Statement
A ball, mass m = 1.5 kg is twirled at constant speed v at the end of a massless string in a vertical circle of radius r = 1.2 m. The period for this uniform circular motion is T = 1.3 s. Free body diagrams for the ball at the top and at the bottom of the circle are shown...
1. Mr. B takes his grade 12 physics class to the local amusement park at Hopedale Mall to conduct some experiments on friction and centripetal force in the gravitron. The Gravitron is an amusement park ride shaped like a vertical cylinder with a radius of 7m. Riders stand with tier backs against...
Hello Physics Forum, I am new member and this is my first Thread. :smile:
While onto the problem. I have been stuck on this particular for well over a week. I do not get the excat answer and to me my solution seems logically.
Homework Statement
An Australian bushman hunts kangaroos with a...
I was doing a lab in which i had a string passing through a glass tube, on one end we had washers while on the other end we had a rubber stopper. Now i understand that the washer will have force of gravity on them which will create tension which will be the centripetal force. So when i begin...
Hi, can anyone please tell me the fomular for the velocity of a centripital force with the radius of 100 cm, with one revolution revolting in 0.98 seconds?
Homework Statement
an inclined plane with angle 30 degrees has a mass on it. The static friction coefficient is 0.2 and the mass is 2 kg. The system then rotated to form a circular path with radius 3 m. Find the angular frequency so the mass will stay stationary.
Homework Equations...
Now as I understand, a force must be present to cause centripetal acceleration. So as a car goes around a circular arc it is friction between the tires which causes centripetal acceleration. So since the car is turning around the curve the friction will be perpendicular to the instantaneous...
Homework Statement
A race-car driver is driving her car at a record-breaking speed of 225kh/h. The first turn on the course is banked at 15 degrees, and the car's mass is 1450kg.
a) Calculate the radius of the curvature for this turn
b) Calculate the centripetal acceleration of the car...
Hi,
I'm currently taking 1st semester Physics and am trying to understand centripetal force relative to the Earth's rotation.
From what I understand (using a bucket of water tied to a string as an example), swinging a bucket in a circular motion, when the bucket is completely above your...
Homework Statement
An 80 kg pilot, makes a loop the loop in a jet, the jet maintains a constant speed of 305 m/s and the radius of the loop is 1.900km. What is the apparent weiht that the pilot feels( Force) at the bottom of the loop the loop.
Homework Equations
Acp=w^2/r
w=(v/r)
F= ma...
1. A computer is reading data from a rotating CD-ROM. At a point that is 0.0330 m from the center of the disk, the centripetal acceleration is 264 m/s2. What is the centripetal acceleration at a point that is 0.0702 m from the center of the disc?
2. ac=v2/r
3. So my thoughts here...
I'm doing a lab, and I need to determine the centripetal force of a ball tethered to a string, rotating around at a constant acceleration horizontally. In this instance, is the only force in the problem the centripetal force, in which case would also be the net force, or is there also a normal...
Water in the Bucket: Free Body Diagram?? (Vertical Centripetal Force)
Homework Statement
If a bucket tied to a rope is revolving vertically in an counter clockwise direction, what would be the Free Body Diagram of "water" in the bucket at the top position?
Homework Equations
There...
ok so I am sure you all know about the lab where u have to find relation between Fc frequency,radius,mass,velocity with stoppers and such. so my final discussion question states: It should be noted that in this investigation the radius of rotation is only an approximation,particulary at lower...
Homework Statement
Since I ran out of time in class, I have to make up my own times for this lab using calculations.
The lab consists of our providing a little force by shaking this tube. Inside this tube is a string, and at one end of the string is attached a hanging mass, the other end a...
centripetal force (urgent)
Homework Statement
what should a centripetal force vs. velocity(speed) graph look like.
what should a velocity(speed) vs. radius(of the circle) look like.
what should a velocity(speed) vs. stopper mass graph look like.
Homework Equations
To find...
I've attempted to solve this problem but I'm not really sure if I'm doing it right. I've looked up other threads containing the same question, but they just don't have the answers I'm looking for. Thank you in advance to anyone who helps.
Homework Statement
A race-car driver is driving her...
Homework Statement
A man hanging upside down is holding a partner who weighs 475 N. Assume that the
partner moves on a circle that has a radius of 6.50 m. At a swinging speed of 4.00 m/s,
what force must the man apply to his partner in the straight-down position?
Homework Equations...
trivial centripetal force...
hello forum,
a simple, qualitative question.
A centripetal force serves to curve the trajectory of an object (acceleration that only changes the velocity direction, not the magnitude).
But why is the object not pulled inward as well? I can see the turning...
A stone has a mass of 5.0 10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.71. When the tire surface is rotating at 20 m/s, the stone flies out of the tread. The...
Homework Statement
Write a proportionality statement for F, m, f and r using your three proportionality statements.
Homework Equations
F = centripetal force
f = frequency
m = mass
r = radius
F \propto f^2
r \propto F^2
m \propto F^2
The Attempt at a Solution
m \propto...
1. A bird of mass 0.211kg pulls out of a dive, the bottom of which can be considered to be a circular arc with a radius of 25.6m. At the bottom of the arc, the bird's speed is a constant 21.7m/s. Determine the magnitude of the upward lift on the bird's wings at the bottom of the arc.
I am...
In an amusement park ride called The Roundup, passengers stand inside a 18.0 m-diameter rotating ring. After the ring has acquired sufficient speed, it tilts into a vertical plane. Suppose the ring rotates once every 4.90 s. and the rider's mass is 58.0 kg.
A.) With how much force does the...
In an amusement park ride called The Roundup, passengers stand inside a 18.0 m-diameter rotating ring. After the ring has acquired sufficient speed, it tilts into a vertical plane. Suppose the ring rotates once every 4.90 s. and the rider's mass is 58.0 kg.
A.) With how much force does the...
Homework Statement
A person is flying an 82 g model airplane in a horizontal circular path on the end of
a string 11m long. The string is also horizontal (ideal situation). It exerts a force of
3.22N on the hand of the person holding it. What is the speed of the plane...
Homework Statement
If a curve with a radius of 88m is perfectly banked for a car traveling 75kn/h, what must be the coefficient of static friction for a car not to skid when traveling at 95 km/hHomework Equations
F=m(aR)
F(Normal) x sin0 = m(v^2/r)
The Attempt at a Solution
I've asked my...
Homework Statement
simple question really - how do you draw the free body diagram for a car going around a corner?
Homework Equations
n/a
The Attempt at a Solution
i know the net force, the centripetal force, points towards the middle. i have an engine force pointing tangentally...
This problem seems simple, but I can't get the answer:
Homework Statement
Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 10.0 m long. His speed at the bottom of the swing is 8.0 m/s. Tarzan does not know that the vine has a breaking strength of 1000 N...
Suppose if you're spinning a thread by your finger that has a cup attached to it at the other end. You would need to keep wobbling your finger or the cup would stop spinning, right? Then why doesn't the Sun wobble to keep the planets spinning around it? Or does the cup stop spinning because of...
Homework Statement
A 1000 kg sports car moving at 20 m/s crosses the rounded top of a hill (radius = 100m). Determine (a) the normal force on the car, (b) the normal force on the 70 kg driver, and (c) the car speed at which the normal force is zero.
Homework Equations
F = ma
Fn = mg
a...
Please help with the following problem:
1. A front-loading clothes washer has a horizontal drum that is thoroughly perforated with small holes. Assuming it to spin dry at 1 rotation per second, have a radius of 42 cm, and contain a 3.9 kg wet Teddy bear, what maximum force is exerted by the...
Homework Statement
Assume that the standard kilogram would weigh exactly 9.8 N at sea level on the Earth's equator if the Earth did not revolve about its axis. then take into account the fact that the Earth does rotate so that this mass moves in a circle of radius of 6.4 * 10^6 meters at a...
Homework Statement
A pilot, whose mass is 78.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 105 m/s and that the radius of the loop-the-loop is 0.562 km. What is the apparent weight that the pilot feels (i.e., the force with which the pilot presses...
I was learning a bit of centrifugal/centripetal forces, and then I asked myself. If at the equator, the Earth rotates at about 1,700 kilometers per hour, then why don't we go flying outside the Earth due to the absence of centripetal forces. And if the gravity is enough to keep us on Earth, then...
A stunt pilot who has been diving vertically at 150m/s pulls out to dive into a circle in the vertical plane.
a)What is the minimum radius of the circle, if the force on the pilot is not to exceed 6g.
b)If the pilot has a mass of 80kg, what is the apparent weight of the pilot at the lowest...
ok the textbook says Centripetal Force always points towards the centre of circle as well as the Centripetal acceleration. But Why?
Also I was given a diagram in the textbook like the one below. I don't understand why
Fc = the friction force...
I am forming a concrete utility pole centripetaly in the mould (lathe). I need to have it form with an aperature(box shaped hole). I need to place a box to form the hole for the aperature and it needs to be of proper weight. the weight the concrete would of been had there been no aperture. It is...
In a few chemistry books/resources I've seen the Bohr model of the atom is developed equating the electrostatic force to a centripetal force. Yet these sources also depict the centripetal force as being directed outward, away from the nucleus. (a single proton for the H atom) One even called it...
1. What is the maximum speed with which a bike can move at a curve, and on which angle from the vertical should he turn, so that he doesn't fall off the road, if the coefficient of friction is 0,4 and the radius of the curve is 100m?
Now, I easily calculated the maximum speed by equating the...