What is Attraction: Definition and 302 Discussions

The basic law of electric charge fields is that like charges repel and unlike charges attract. This does not come out of the equations but is inserted as just an empirical observation that must be allowed for, is it not ? Am I missing something here? Compare gravity that is always an...

Here are three questions on my physics homework and my attempts to solve them...am I looking at this the right way? Question 1: A tire placed on a balancing machine in a service station starts from rest and turns through 4.7 revolutions in 1.2 seconds before reaching it's final angular speed...

Homework Statement We just have learned about Gravitational Attraction. The formula (for those who don't know is Fg = G (m1m2/s Squared) M meaning Mass G meaning universital gravity S meaning distance between I had to research the mass/radius of the Earth. I was given the mass/radius of...

Homework Statement An astronaut working in the cargo bay of a space shuttle accidentally released the lifeline when picking up a toolbox. The mission control computers quickly calculated the astronaut was drifting away from the space shuttle at a constant speed of 0.350m/s. The astronaut...

I'm a first year physics student, so I don't know too much about advanced physics, though I try to read a lot of physics books, mainly on Grand Unified Theories and such. Yesterday when I was in my physics class, a thought came to me. Could gravity be completely be explained by magnetism? What I...

Homework Statement Two objects attract each other gravitationally with a force of 2.7 10-10 N when they are 0.25 m apart. Their total mass is 4.0 kg. Find their individual masses. larger mass - I kind of guessed this was 4.0 kg but don't know how to do it. smaller mass ? kg The...

Hello, I'm trying to solve a problem, but I'm doing something wrong. This is the problem out of my Physics book, but the problem I'm working on has different numbers, so any help will not be cheating, I just need to know the process. Problem: Two objects are attracted to each other...

Homework Statement Tom has a mass of 70.0 kg and Sally has a mass of 50.0 kg. Tom and Sally are standing 20.0 m apart on the dance floor. Sally looks up and sees Tom. She feels an attraction. If the attraction is gravitational, find its size. Assume that both Tom and Sally can be replaced by...

Homework Statement Calculate, using Newton's law of gravity, the size of the force of attraction between the Earth and a mass of 3.0 kg on the Earth. Data: Distance to the center of Earth from the surface = 6370 km. Mass of Earth = 5.98 1024 kg. Gravitational constant (G = 6.67 times 10-11...

I'm trying to find a good model, and I wanted to find a process that fits. The Poisson process almost fits, but unfortunately the independence assumption is too strong for my data. Is there a similar process that has a parameter (or several) that allow for points to attract or repel others...

I know that when quarks move away from the centre of a particle the attraction force on them increases. How and why does this happen? What happens if using an extreme amount of energy you do move it away to a decent distance? If the force gets stronger as it moves away, is there any force when...

How do you calculate the attraction and repulsion forces between two magnets? I know it depends on many factors, so for example: two 0.5"x0.5"x0.25" Neodynium magnets with a grade of 42 (Br = 13200 Gauss) that are 0.25" apart from each other (only air is separating them). Thanks for any help...

Oh god, please help... 1. Describe the attraction forces between atomic solids. Upon what factors do the strength of these forces depend? 2.Which of the noble gases would have the highest melting point? Why? :blushing:.. I'm not very good at chemistry

hi... actually, i got dust under my ipod screen,,, I've been searching for was to remove it without getting it naked... so i thought of electrostatic induction... i thought that, rbbing a pen with my hairs and then approaching it to my screen, the dust particles would be moving at least...

Homework Statement A particle is projected vertically upward from the Earth's surface with initial speed Vo. Prove that the maximun height H reached above the Earth's surface is H= Vo^2R/(2gR-Vo^2) The Attempt at a Solution R is the Earth's radius. If the gravitational...

ok F is an object that has no graviational attraction (i know its absurd, but its just to understand something cinetic energy/velocity) F also is not a feromagnetic material , and is charged neutral Ok now : if i i am outside , i have F in my hand , and i let it go would it...

In a galvanic cell is it the anions from the electrolyte which is attracted to the cathode or is it the anions produced from the anode dissolving which flow to the cathode?? Also it mentions that the charges increase in energy as they pass through the power supply and they decrease when they...

Homework Statement How would one go about calculating the increasing gravitational attraction between objects, one assumed for the purpose of the calculation to be motionless, and the other moving towards it according to the gravitational attraction.? Homework Equations F = GMm/r^2...

Homework Statement Homework Statement Two objects, one with a mass of 200g, and the other with a mass of 1 kg are placed 10 cm apart. What is the gravitational attraction between the objects? Background: I'm performing an experiment in which a horizontal beam is suspended just above the...

Hi, I hope this is the correct place to ask this. Does anyone know of a formula to calculate the force of attraction or repulsion between two magnets of diffirent sizes and strengths? Also the magnets are not parallel to each other. Any help highly appreciated.

okay so this is my first time posting anything here so forgive me if I've done something wrong (and do let me know). but I've been struggling with this problem now for a couple days and it seems like the answer is on the tip of my tongue but i can't come up with the steps. so if anyone could...

The weight of a person at the equator, as determined by a spring balance, is 725N. By how much does this differ from the true force of gravitational attraction at the same point? Assume that the Earth is spherically symmetric. This question is on a section that we havn't even done yet so I...

Why does the north pole of a magnet attract to the north geographic pole of the Earth?

hola... I recently moved from a house with two guys to a house with two girls. I moved out for space reasons but also because I didnt like my old roommates anymore. I found these girls through a flyer on campus and I knew there would be tension the first time I met them. They are both very...

How do force particles (photons, gluons..) exert force? I once read that it worked sort of the the way the throwing a ball at someone would move both of you - you'd get pushed back cause of the 3rd law and he'd fly forward cause of momentum conservation. but how do the force particles attract...

After a rain, when there are tiny water droplets hanging down from places, I can put my dry finger near one of the droplets and if my finger is close enough to the droplet, it will jump onto my finger. Just like a metal jumping onto a magnet. What physical explanation could be given here? Is...

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...

Why do like electrical charges repel and opposite charges attract? Is it to do with obtaining lower energy levels through movement?

For two hydrogen atoms separated by 3 Angstroms, what is the main force (cause) for the two atoms to move closer toward each other? As the atoms get closer, does a different force (cause) dominant the original force that started the attraction?

I don't know how to do this, 2 Cokes standing 35 cm from each other, Calculate the attraction to each other. One can weights 365grams. Ok I know we should use G*m1m2/r1 and I have tried that and the result becomes only wrong like this 0,365*0,365 / 0,35 =0,3806428571 * 6,67*10^-11...

the universe is expanding. The space between particles of an object is also expanding. So will the force of expanding eventually break the attractive force between particles? stupid question.. help me please anyway thanks

I just recently started studying physics about a month ago, so I'm not too good at it yet. Anyway, here's the problem: When a certain object is 100 meters above the surface of the Earth, Earth's attraction for it is 10 Newtons. In order for Earth's attraction for the same object to be only 5...

Could you please give me some brief explanation of the attraction of light by gravity. Or maybe some links where I can read something about it. :) Thank you!

I am an amateur writer, and I do not have much more than a basic knowledge of physics. I am however, attempting to write a book centered around a new propulsion system and a trip out of our solar system. I will give everyone reading this a basic idea of the system, then I hope to read feedback...

Hi All, In the attached figure, I have drawn some "virtual" ions of two kind: blue are sodium, and violet for potassium (normally solvated with water). There is more ions outside of my "vat" (bilipidic layer) than inside. All ions are supposed as positive. Since there is a difference...

anyone want to check my work, i would greatly appreciate it: the quest. asks you to find law of mass attraction to calculate force of gravational of Jupiter towards sun: used formula: F = GMm/R2 = (6.67e-11)(1.99e30)(1.90e27)/(7.78e6)2 FJupiter = 4.17e33 Newtons ?? Then it asks...

In theory: If mass is created all the sudden, how long does it take for another pre-existing mass to "feel" the new one? is this dependant on the medium through which the "pulse" travels? would it be instant? would it be light speed?

The purpose of this thread is to present an analysis of the attraction of a particle to a solid disk of material of density rho. It will be shown that the result is finite and very small - and incidentally that the accleration is nearly uniform along the vertical axis regardless of one's height...

Here is the ex. in the book. Two 3.kg textbooks are .15 apart. What is the gravitational attraction? The answer is given 2.7*10-8 I also know the formula is F=Gm1m2/r I just do not understand what they are doing to get the answer. (6.67*10-11 N-m2kg2)(3.kg)(3.kg)/.15 This is the...

K the question is basically where you are given the Earth's Mass (5.98*10^24kg) the moon's mass in this equation is 1.2% of the mass of the earth. (7.176*10^22kg) We are also given that the distance from the centres is 3.84*10^5km (converted to metres is 3.84*10^8) So I have no problems with...

Just a quick question i wonder some one could help me with, when ions charge do they attract the charge in some way or does the charge have to be some how taken to them throught a thrid party reaction or process, and does enviorment have any affect in the charging process thankyou

is the gravity above the ground 8000km is less gravity from the ground than on the ground?because i think that the distance will affect the attraction

For about as long as I can remember, I have noticed that when I am standing somewhere while people are passing close by me I always feel a small "tug" as they go by. The little tug is always toward them. It always makes me wonder what causes it. After I feel the tug, about a second later I feel...

I understand the whole part about electrons exchanging virtual photons to cause the "repelling" phenomenon but I don't understand at all how attraction works, I know its a totally different analogy from the "two guys standing on slippery ice and tossing a basketball back and forth to each other"...

Why do things interact? Why do things attract? Why do things repel? Physics does not explain why. It can only describe how. The result of all interactions is the force. This force is carried by the quanta of the interactions. If the quanta do not interact with themselves, the...

Opposite charge always attract and same charge repel each other. Will proton and electron crash on each other? What will happen if they do so?

I briefly scanned back through old topics in this part of the Physics Forum, and didn't see any that seemed to bring up this exact issue, so... I have read in several popularizations of physics that the exchange of bosons between a pair of identical particles will cause attraction if the...

I place two permanent magnets on a desk so that their poles are orientated for attraction. I take my hands away and they move towards each other. Where does the energy come from? Are the magnets now slightly less magnetic?

The Big Picture Gravity, Tornados and the Evolution of Matter An idea proposed by John Kanelous Years ago I saw a video on TV that was taken by a cameraman in a helicopter who had flown, what appeared to be, way too close to a tornado. I saw palm trees being plucked vertically (not...

Newbie here, so go easy. The electron contains a negative charge, the proton has a positive charge, so why is there no attraction between the two? Why doesn't the electron spiral towards the nucleus? The electron is an accelerating body, so why is no radiation being emitted? Thanks