Resistance
Resistance is when you resist an action that your body wants to take. For example, if you are trying to lift a weight and your muscles want to stop the movement because it is causing too much strain on them, that is resistance.
In order for the force of gravity to not be resisted by objects in a swirling liquid (such as water), there must be enough viscosity around which resists the flow of particles in other directions than downward. There are a number of different types of viscosity; each have different effects on things that are being circulated in the flow. If something is not flowing through the liquid in liquid form, it is not going to be affected by the viscosity of the water.
Pronounced Vee-Sos-Hee: This refers to whatever is impeding or slowing down a moving object's movement. It does this by blocking objects from moving through it with as little resistance as possible. For example, water is a good "viscosity" because it blocks almost nothing and has a very high viscosity. As such, the objects that are being pushed or pulled through the water have to deal with a lot less resistance and therefore move through it significantly faster than they would in another medium.
Vis: This refers to the "flow" of particles in whatever medium is being circulated. Because the particles are in constant motion, they will naturally resist being forced to move and cause some sort of resistance to whatever is moving them. In the case of water, this is called "viscosity", because it obstructs and slows down the movement of the particles that make up the substance so much that it makes it feel as if there is a sticky substance in the way.
The viscosity and motion of water are due to variations in density over time. This creates a friction, which causes resistance against objects moving through the liquid. The force of gravity is also in flux over time, and it tries to pull objects towards the earth because this is its natural tendency. As such, it has both a viscosity (the way it resists things) and a motion (the way it acts), and this makes it behave like water.
The motion of water molecules is due to their natural tendency to align themselves with each other. This is an example of "order", and it is responsible for the viscosity of water.
The higher the viscosity, the less likely something is to be able to pass through it. The more viscous something is, the smaller its flow and particles tend to cluster together more tightly. This makes things that are being pushed or pulled through the liquid move very slowly, so they can be thought of as being slower in the medium because they are moving slower.
At the same time, the higher viscosity also causes a less dense medium, so an object will feel lighter in its current medium. This makes it feel as if there is less resistance as it moves through the liquid. As it is still moving through the liquid, it has to push against more resistance from its own weight (which is very important), so the force pushing it down (gravity) feels heavier than before.
The viscosities of liquids can be broken down into four different categories:
Although there is a difference between the viscosity of a liquid and its resistance, there is no true substitute for the concept of viscosity. Viscosity is related to resistance and therefore gives more insight into the overall behavior of a substance when it is being pushed or pulled through the medium. This includes both subtle effects that a person may notice, as well as large changes in the properties of substances such as their strength.
In addition to the four main types of viscosity, there are two additional categories: polymer and mineral. Polymers are a type of "order" that causes materials to resist being pushed through it in the same way that a viscous fluid does. Mineral is a type of "disorder" that breaks up the order of materials and causes them to resist being pushed through it in the same way that a less viscous fluid does.
Liquid viscosity is discussed in several other places as well, including the experimental section of the Condensed Glossary, while solid viscosity is shown under the "Hardness" section of the Condensed Glossary.
Gravity: The natural tendency of everything to fall towards the center of mass (call it planet "X", call it gravity, call it whatever you want to) when no other force is acting on them.
Note that gravity is not a force in the sense that it has a positive or negative charge, or that it is susceptible to the Electromagnetic Force. Gravity is simply an effect that is seen when you fall down (or towards the center of mass). For example, when you are on Earth, the effect of gravity makes you sink into the ground.
The only time when gravity becomes a force is if something else wants to move in a different direction than it is supposed to.
Conclusion: Gravity is a force. The only time gravity becomes a force is when another force wants to move as well.
The speed of light: This is the fastest thing that can ever move through the universe, because it moves at exactly 299,792,458 meters per second (the square root of 2 times 10 to the 17th power). It may seem that nothing can ever move faster than this, but there are two exceptions to this rule.
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