Which fundamental force dominates the universe




















The electron and anti-neutrino are ejected from the nucleus. The force responsible for this decay and emission must be different and weaker than the strong force, thus it's unfortunate name -- the weak force or the weak nuclear force or weak nuclear interaction. With the discovery of quarks, the weak force was shown to be responsible for changing one type of quark into another through the exchange of particles called W and Z bosons, which were discovered in Ultimately, the weak force makes nuclear fusion in the sun and stars possible because it allows the hydrogen isotope deuterium to form and fuse.

From the fields of QED and quantum chromodynamics , or QCD , the field of physics that describes the interactions between subatomic particles and nuclear forces, we see that many of the forces are transmitted by objects exchanging particles called gauge particles or gauge bosons. These objects can be quarks, protons, electrons, atoms , magnets or even planets.

So, how does exchanging particles transmit a force? Consider two ice skaters standing at some distance apart. If one skater throws a ball to the other, the skaters will move farther away from each other. Forces work in a similar way. Physicists have isolated the gauge particles for most of the forces. The strong force uses pions and another particle called a gluon.

The weak force uses W and Z bosons. The electromagnetic force uses photons. Gravity is thought to be conveyed by a particle called a graviton ; however, gravitons haven't been found yet. Some of the gauge particles associated with the nuclear forces have mass, while others don't electromagnetism, gravity. Because electromagnetic force and gravity can operate over huge distances like light-years, their gauge particles must be able to travel at the speed of light, perhaps even faster for gravitons.

Physicists don't know how gravity is transmitted. But according to Einstein's theory of special relativity, no object with mass can travel at the speed of light , so it makes sense that photons and gravitons are mass-less gauge particles. In fact, physicists have firmly established that photons have no mass. Which force is the mightiest of them all? That would be the strong nuclear force. However, it acts only over a short range, approximately the size of a nucleus.

The weak nuclear force is one-millionth as strong as the strong nuclear force and has an even shorter range, less than a proton's diameter. The electromagnetic force is about 0. Finally, gravity is the weakest force at about 6 x 10 times that of the strong nuclear force.

Gravity, however, has an infinite range. The idea isn't unprecedented. We once thought of electricity and magnetism as separate entities, but the work of Oersted, Faraday, Maxwell and others showed that they were related. Theories that relate the fundamental forces and subatomic particles are called fittingly grand unified theories. More on them next. So when electrons zoom through a wire to charge your computer or phone or turn on your TV, for example, the wire becomes magnetic. Electromagnetic forces are transferred between charged particles through the exchange of massless, force-carrying bosons called photons, which are also the particle components of light.

The force-carrying photons that swap between charged particles, however, are a different manifestation of photons. They are virtual and undetectable, even though they are technically the same particles as the real and detectable version, according to the University of Tennessee, Knoxville. The electromagnetic force is responsible for some of the most commonly experienced phenomena: friction, elasticity, the normal force and the force holding solids together in a given shape.

It's even responsible for the drag that birds, planes and even Superman experience while flying. These actions can occur because of charged or neutralized particles interacting with one another. The normal force that keeps a book on top of a table instead of gravity pulling the book through to the ground , for example, is a consequence of electrons in the table's atoms repelling electrons in the book's atoms. The strong nuclear force , also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature.

And that's because it binds the fundamental particles of matter together to form larger particles. It holds together the quarks that make up protons and neutrons, and part of the strong force also keeps the protons and neutrons of an atom's nucleus together. Much like the weak force, the strong force operates only when subatomic particles are extremely close to one another.

The strong force is odd, though, because unlike any of the other fundamental forces, it gets weaker as subatomic particles move closer together. It actually reaches maximum strength when the particles are farthest away from each other, according to Fermilab. Once within range, massless charged bosons called gluons transmit the strong force between quarks and keep them "glued" together. A tiny fraction of the strong force called the residual strong force acts between protons and neutrons.

Protons in the nucleus repel one another because of their similar charge, but the residual strong force can overcome this repulsion, so the particles stay bound in an atom's nucleus. The outstanding question of the four fundamental forces is whether they're actually manifestations of just a single great force of the universe. Thus, the quarks inside of the protons and neutrons are bound together by the exchange of the strong nuclear force. Note: While they are close together the quarks experience little force, but as they separate the force between them grows rapidly, pulling them back together.

To separate two quarks completely would require far more energy than any possible particle accelerator could provide. There is speculation, that In the very early Universe when temperatures were very high the Planck Scale all four forces were unified into a single force. Then, as the temperature dropped, gravitation separated first and then the other 3 forces separated.

Even then, the weak, electromagnetic, and strong forces were unified into a single force. When the temperature dropped these forces got separated from each other, with the strong force separating first and then at a still lower temperature the electromagnetic and weak forces separating to leave us with the 4 distinct forces that we see in our present Universe.

The process of the forces separating from each other is called spontaneous symmetry breaking. Qn: The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statement is not correct? Alex Andrews George is a mentor, author, and entrepreneur. He is the author of many best-seller books like 'Important Judgments that transformed India' and 'Important Acts that transformed India'.

He contradicts himself. In the four types of forces I did not find hydrodynamic forces, from waterfalls for example, so I think that this one is missing in the four types of natural forces. The question is: is this type of force derived or associated with one of the four types described in this classification?

Because they both have mass, the two protons exert gravitational attraction on each other. Because they both have a positive electric charge, they both exert electromagnetic repulsion on each other. Also, they both have internal "color" charge and thus exert attraction via the strong nuclear force. Because the strong nuclear force is the strongest at short distances, it dominates over the other forces and the two protons become bound, forming a helium nucleus typically a neutron is also needed to keep the helium nucleus stable.

Gravity is so weak at the atomic scale that scientists can typically ignore it without incurring significant errors in their calculations. However, on astronomical scales, gravity does dominate over the other forces. There are two reasons for this: 1 gravity has a long range, and 2 there is no such thing as negative mass. Each force dies off as the two objects experiencing the force become more separated.

The rate at which the forces die off is different for each force. The strong and weak nuclear forces are very short ranged, meaning that outside of the tiny nuclei of atoms, these forces quickly drop to zero.



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