George E. Cawthon wrote:
Electro-magnetism is one force, another is
gravity. Here is your question, name two other
Some, but not all, forces:
Friction, electrostatic, buoyancy, elasticity, adhesive,
aerodynamic lift, thrust.
Fictitious forces: coriolis, centrifigual.
Political forces: GOP, DNC.
As it turns out, these are implemented via any or any combination of the
4 known fundamental forces of the universe. None of these use either the
strong or weak nuclear force. Basically it's the electromagnetic one -
via electrostatic repulsion of electron shells of atoms, and any
electrostatic attraction between molecule regions having an "above-normal
concentration of electron presence" (molecule regions negatively charged)
and molecule regions having a "below-normal concentration of electron
presence" (molecule regions positively charged). Although often enough we
How we feel these (or the non-fictitious forces that the fictitious
ones are "the equal and opposite reaction to", as in the force that
forces an object to take a curved path) is normally through the
electromagnetic one of the four known fundamental forces of the universe.
Despite all the good answers here, I think that your son is asking how
does something in the magnet reach out and with no apparent means
attract a piece of iron. And I think the answer is that no one knows.
It's observable, and observers can give lots of details, but that is
not the same thing as saying how it happens.
IIRC and part of this I clearly don't RC, there are two
inter-something forces, the small and the great xxxxx. One of them
is what makes atoms and molecules stick together, and the other is
magnetism. They can be described in detail, like similar poles repel
and opposite poles attract, and even more detail than that, but none
of this says how it happens.
1. If you cut a magnet in half, you get two magnets each with a N and S pole
2. If you hit a magnet with a hammer, (or drop it) you might lose some
if not all of the power (or magnetism).
3. You can rub a screwdriver on a magnet and transfer some magnetism to
the screwdriver. Just my 2 cents Chuck
It's observable and more importantly predictable. That's basically the
extent of the science there (don't get me wrong, it's very important and
useful, but not the same as true understanding, as you say.)
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