What are the primary roles of each of the fundamental forces?
The four forces are the strong force, the weak force, electromagnetism and gravity. Each plays a different role on different scales.
The weak force is primarily involved in altering the character of charged particles (as most of its bosons are charged, which is unusual). This means it is involved in beta decays where, for example, a neutron 'splits' to form a proton and an electron.
Electromagnetic forces only affect charged particles, and are responsible for most of the large-scale physical effects we experience - light, sound, heat, chemical changes etc. This is because, though much less powerful, it is the first one that has infinite range (though it diminishes significantly with distance.)
Finally, gravity. This is a problem for physics. It has infinite range (much like electromagnetism) but is stunningly weak, just impossibly feeble (a tiny fridge magnet can pull harder on a photograph than the whole planet pulling in the opposite direction) yet no one knows why. It is also the only significant force on cosmological scales i.e. it dominates galactic motion.
So far the first three have essentially been incorporated successfully into an overarching theory (QCD) but gravity has never been included. I don't really understand why, but a very clever person once told me that the first three forces are fundamentally numerical theories (statistics based on quantum theory) whereas gravity is geometrical (or topological.)
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The primary roles of each of the fundamental forces are as follows:
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Gravity: Gravity is responsible for the attraction between objects with mass. Its primary role is to govern the motion of celestial bodies, such as planets, stars, and galaxies, on a macroscopic scale.
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Electromagnetic Force: The electromagnetic force is responsible for interactions between electrically charged particles. Its primary roles include binding atoms together to form molecules, generating electric and magnetic fields, and facilitating electromagnetic interactions such as light and radiation.
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Weak Nuclear Force: The weak nuclear force is involved in processes such as beta decay and neutrino interactions. Its primary role is to mediate the decay of unstable subatomic particles and contribute to the transformation of particles within atomic nuclei.
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Strong Nuclear Force: The strong nuclear force binds protons and neutrons together within atomic nuclei. Its primary role is to overcome the electrostatic repulsion between positively charged protons, thereby confining them within the nucleus and stabilizing atomic structure.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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