What is Attraction: Definition and 302 Discussions

I have seen the movie 'The Secret Law of Attraction'. It seems to remind my of quantum physics a bit. However, I read about the concept behind the creation of the movie and have come across a lot of controversy. Some people are saying the law of attraction usually does not take the function of...

From a Serious Newbie Have been interested in and fascinated by physics for a number of years now and am a total layman but watch every science/astronomy programme I can and have read a couple of very basic books on the subject, and have now steeled myself to read “A Brief History of Time”. I...

I was thinking about this problem today: You have two nearly identical charged particles, except that one has a charge of +1 C and the other has a charge of -1 C. If you place them at rest one meter apart, how long will it take for them to collide, and what will be their velocities when they...

Which comes first , magnetic attraction or magnetic induction and Why?

Relativity, Gravity, "Attraction", Curved Space Okay, I am by no means knowledgeable in this field, probably more dangerous than anything. But I have a question about gravity. If two masses are identical (in an idea situation) and have no other forces acting on them, and start from a...

Homework Statement what is the gravitational attraction between two students with masses of 70 kg and 50 kg, if they are 1.5 m apart? Homework Equations Fg=Gm1m2/r^2 The Attempt at a Solution so my Fg is 6.67 x 10^-11, m1 is 70 kg and m2 is 50 kg. for my radius, do i just use the 1.5...

I know that two infinitely long straight conductors will attract each other when kept parallel if current flows in the same direction in both. If two circular loops are placed such that their planes are parallel, current in the same direction, will they attract? Also, does a loop carrying...

Is there a distance where the curvature in spacetime created by an object's mass ends? Is it a finite gravity well or does the curvature just get infinitely weaker?

First off... woo a physics forum. It's been a while since I have posted in a forum, but I couldn't resist a physics forum :) I just finished Richard Feynman's QED: The strange theory of light and matter. It brought up many questions, obviously, but the one I am currently trying to figure out...

Hi PF Pros... I wonder if you can help me... I am trying to see if there is a formula for how fast magnets attract. I know that there is the inverse square in terms of power loss and that magnetism is a field that travels at or near light speed. But, for example, if I have 2 cyllander...

Could the effect of "Dark Matter" be explained if in the formaul for Gravitational attraction: F = GMm/d^x Where x is considered 2 is wee bit less (may be 1.98 or some thing)

What causes mass attraction? Please expalin it so that its easy to understand?

Hello my fellow physic-doers, If say a nucleus containing 2 protons pulls on 2 electrons. Will the electron be pulled closer if the number of protons is constant but there is only one electron assuming there was no repulsion between 2 electrons in the first case? Does the electromagnetic...

Hello again PF peeps! I'm sorry if this might sound like the unoriginal question of the day, but its been bothering me for quite some time now. Here it is: Lets choose hydrogen to keep things simple... Why doesn't the electron of hydrogen spiral into the proton? If the EM force is supposed to...

In the Spanish second edition of "Electricity and Magnetism", Berkeley Physics Course, volume II, page 27, Purcell states that a cube with a perfectly constant density does not attract external bodies as if its mass was concentrated in its geometrical center. However he does not say how does...

Assuming a universe with only space and two motionless masses, would the two masses start to move toward each other?

Suppose that in free space , dust particles are evenly distributed all around. Amidst the dust particles , there are two identical spherical cavities at some distance from each other. Do you think they will attract each other or repel or just be as they were??

The homework problem reads as follows: A proton and an electron are held in place on the x axis. The proton is at x=-d, while the electron is at x=+d. They are released simultaneously, and the only force that affects their motions is the electrostatic force of attraction that each applies...

I have questions about magnetic attraction in both conceptual and application. I am not a physicist (medical background) so I may have insufficient understanding of the concepts involved, but any clarification would be helpful. Suppose I have a field source, such as a permanent magnet, and a...

Hi, I have an exam coming up soon. But I thought I would clear my doubts ahead of time. 1. A fixed conducting ball has charge q1= 3X10^-6C. An identical ball with charge q2 is held at a distance x away from q1. The two balls attract each other with a force of 13.5N. The balls are then...

Good day, I'm currently studying about the effectiveness of Teflon® PTFE as a protective coating for a geothermal piping system. Part of the pipe is submerged in brine and experience corrosion and scale build-up during its past operations. I was thinking of applying the said coating...

Hi all- I have the following problem that I am trying to understand:1. Problem statement. Show that the force of attraction within a spherical shell of constant density is everywhere 0. Homework Equations My understanding of the statement is that, for example, in a gravitational field, the...

Trying to figure out the gravitational attraction between two objects using Newton's Law of Universal Gravity.Need to figure out what the force is.Here is a model.If anything is in ordinary parentheses then it is an exponent. ----------------------G --------____________|_____________400x300...

I would like to know if electrical charge is the only way to explain attraction and repulsion of e- and p+.

[b]1. The mass of the Moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (centre to centre) is 3.84x10^5 km, calculate...

Homework Statement If you're standing on the ground 17 m directly below the center of a spherical water tank containing 6.0×106kg of water, by what fraction is your weight reduced due to the gravitational attraction of the water? Homework Equations F = GMm/r^2 The Attempt at a...

Homework Statement The mass of the Moon is 7.36 x 10 ^ 22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (center to center) is 3.84...

Homework Statement Calculate the force of attraction between Ca2+ and O2- ions whose centers are separated by 1.25 nm. The Attempt at a Solution Well, I believe this is a matter of electrostatic force (Coulomb's Law)...but I am not sure what to use for the values of q1 and q2 Is it just the...

Homework Statement a particle of mass m is attracted to the origin by a force F=-k/r^2 find the time t for the mass to reach the origin Homework Equations \DeltaU= U-U0 = \int\textbf{F}(r) dr The Attempt at a Solution I found \DeltaU by \DeltaU= U-U0 = \intF(r) dr and by...

2 particles are moving very fast in an "inertial reference frame." What is the force of gravitational attraction between them? Note that at low speeds it is G(m1)(m2)/r^2. Also note that the two particles are not aware of the inertial reference frame with respect to which they are moving very...

Here is my problem: Suppose that electrical attraction, rather than gravity, were responsible for holding the Moon in orbit around the Earth. If equal and opposite charges were placed on the Earth and the Moon, what should be the value of Q to maintain the present orbit? Use these data...

im writing a physics simulator and now I decided to see about implementing the basic matter not just to atoms but down to the fundamental particles, so to start I am trying to figure out how exactly quarks are attracted, like I know an up and down quark are attracted through electromagnetism and...

I have been doing some thinking and I can't find the answer to my question anywhere, so I was wondering if someone else knew. My question is simply this: Do electrons and positrons attract each other electromagnetically, or do the antimatter properties of the positron alter the interaction in...

I'm just curious how long it would take for two 1kg masses separated by 1m to attract each other gravitationally in empty space. The formula for gravitational force is: F_{g} = G \frac{m_{1}m_{2}}{r^{2}} where r is the distance between the two masses. So if the midpoint for the two...

The force of attraction formula between two charges is \frac{(k)(e1)(e2)}{r^2} How does the inverse of r2 fit into the equation? I understand the concept of how distance would need to be the inverse in the function, but why is the distance (r) in the inverse squared? Is this the same principle...

Homework Statement A small mass M and a small mass 3M are 3.60m apart. Where should you put a third small mass so that the net gravitational force on it due to the other two masses is zero?(From mass M) Homework Equations F = G(m1)(m2)/d^2 The Attempt at a Solution I envisioned...

1. Homework Statement Suppose that f: I->I is a continuous and onto map on an interval I. Let x1 be an asymptotically stable periodic point of period k>=2. Show that Ws(f(x1))=f(Ws(x1)) 2. Homework Equations Ws(x), the basin of attraction of x1 is defined as {x: lim (n->infinity)...

hi, the standard (?) explanation for particle exchange to produce repulsion and attraction is at: http://math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html this seems to me to have two problems. 1.) in the case of repulsion beteen two electrons, the direction has to be...

Human tissue contains about 3*10^27 electrons per kg of material. Suppose two humans are located 1370 km apart and each has a mass of 60 kg. We now transfer 5*10^21 electrons from one person to the other. What will be the magnitude of the resulting attraction, rounded to the nearest Newton? I...

Begin with two stars in space, A is 1 solar mass in size, B is two solar masses. The distance between them is such that the equation for gravitational attraction works out to 3 meters per second squared. It seems to me that with A being smaller, it will accelerate towards B at the rate of 2...

Gravitational potential energy usually arises due to the force of attraction experienced by a body. When a small body is placed between to massive bodies (not of equal masses) it is attracted by both. So when we consider the small body’s gravitational potential energy should we take the sum of...

We`ve seen how particles in zero gravity form clumps through electro magnetic attraction, and that these clumps will then develop gravitational forces. Isn`t then gravity merely the same as this electro magnetic attraction only on a larger scale?

Homework Statement The mass of the Moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between Earth and the Mon (centre to centre) is 3.84x10^5...

The mass of the moon is 7.35*10^22Kg. At some point between Earth and the moon, the force of Earth's gravitational attraction on an object is canceled by the moon's force of gravitational attraction. If the distance between Earth and the moon (centre to centre) is 3.84*10^5 Km, calculate where...

Homework Statement The mass of the moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (centre to centre) is...

Gravitational Attraction-Please Help! Homework Statement Two 100kg lead sphers are suspended from 100m long massless cables. The tops of the cables have been anchored 1 m apart. What is the distance between the center of the spheres? Homework Equations Fg= Gm1m2/r^2 The Attempt at...

Hello! The stem from this problem came to me when I was pondering how to describe the motion of two massive objects feeling the others' gravitational attraction (i.e binary star systems or something like that). Well this got ugly fast so I had to simplify a lot of things, and I finally got an...

Suppose I have 2 bodies, M1 and M2. Assuming that no other forces are acting on them aside from gravity, what is the nature of their acceleration over time? As they approach each other, and their distance decreases, does their acceleration also increase? If so, what is the rate at which this...

Homework Statement Calculate the magnetic force of attraction between the northern and southern hemispheres of a spinning charged spherical shell. (ex. 5.11) Homework Equations The Attempt at a Solution I already looked at this https://www.physicsforums.com/showthread.php?t=42020. I am stuck...

[SOLVED] Newton's law of gravitational attraction help? Homework Statement M1 is a spherical mass (38.6 kg) at the origin. M2 is also a spherical mass (10.3 kg) and is located on the x-axis at x = 61.2 m. At what value of x would a third mass with a 15.0 kg mass experience no net...