Physics pt. 7: Fields

 Let's say you drop a ball, and it falls through the ground, why did that happen.
Nothing was pulling it down right, nothing touching it, well it is because of gravity which is a non-contact force that is causing it to be pulled down, but these forces act over a sort of region, so since that ball is on earth it causes the ball the fall due to the ball being in the region known as earth because the ball is in the gravitational "field' of the earth, it falls down and hits the ground.

New field forces include Electrical, Magnetic and gravitational forces, and since these are non-contact they can exert a force without touching an object.

So to understand why things are this way, scientists came up with the idea of: "Fields", which under the definition says: "Objects that extend through space".

Gravitational forces affect objects with mass, think of a ball, a cat, or paper, every object with a Gravitational force has a force that pulls objects near it to its centre the further you move away from the object the weaker the force is.

An Electric field surrounds any object with a net charge, and what is in those fields relies on what direction that charge is going along say, a wire or cable.

Magnetic Fields are for magnets and other materials with magnetic properties.

Every field has two things about it, Magnitude (how strong it is), and Direction (where it's going).

Let's take an example, let's put a planet down, and since a planet has a lot of mass, it will have a strong gravitational pull to its centre, and if we move further away from the planet, the field gets weaker, that's why if you jump on earth you fall back down quickly, but in low orbit space, you float, because the Earth cannot pull you down from that distance.
Now let's put an astroid going parallel from the planet, and its pretty close to the planet. The asteroid will be attracted to the planet as the planet has a strong Gravitational pull, so when it flies by, it might get pulled closer, and closer, until it might crash into the planet due to the astroids proximity to the planet plus the gravitational pull of the planet