What are Opposites in Nature?: 13 (Looking at Nature)

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What is the opposite of nature? - WordHippo What is the opposite of nature? - WordHippo

The weak force is critical for the nuclear fusion reactions that power the sun and produce the energy needed for most life forms here on Earth. Much like the weak force, the strong force operates only when subatomic particles are extremely close to one another. So, for example, a n eutrino that strays close to a neutron can turn the neutron into a proton while the neutrino becomes an electron. It's also why archaeologists can use carbon-14 to date ancient bone, wood and other formerly living artifacts. The electric component acts between charged particles whether they're moving or stationary, creating a field by which the charges can influence each other.

So when electrons zoom through a wire to charge your computer or phone or turn on your TV, for example, the wire becomes magnetic. Carbon-14 has six protons and eight neutrons; one of those neutrons decays into a proton to make nitrogen-14, which has seven protons and seven neutrons. Though gravity holds planets, stars, solar systems and even galaxies together, it turns out to be the weakest of the fundamental forces, especially at the molecular and atomic scales. But once set into motion, those charged particles begin to display the second component, the magnetic force.

CONTRARY definition in American English | Collins English CONTRARY definition in American English | Collins English

And at the molecular and atomic levels, gravity has almost no effect relative to the other fundamental forces. 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. This decay happens at a predictable rate, allowing scientists to determine how old such artifacts are. Centuries later, Albert Einstein suggested, through his theory of general relativity, that gravity is not an attraction or a force. And much like gravity, this force can be felt from an infinite distance (albeit the force would be very, very small at that distance).

Gravity is probably the most intuitive and familiar of the fundamental forces, but it's also been one of the most challenging to explain. Gravity is the attraction between two objects that have mass or energy, whether this is seen in dropping a rock from a bridge, a planet orbiting a star or the moon causing ocean tides. A large object works on space-time a bit like how a large ball placed in the middle of a sheet affects that material, deforming it and causing other, smaller objects on the sheet to fall toward the middle.