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Description
About This Setting
If you actually study physics, there are three different types of friction. Static friction is a force that opposes movement when you push a still object and helps to hold it in place. If you've ever had to drag heavy furnature around a building, such as your home or school, you've probably seen this one in action. It takes more force to get it started than to keep it moving. The inertia of the object hasn't changed, but the friction has. The static friction is working against you as you are trying to get it moving.
Once it's moving, now you're working with the weaker kinetic friction. Kinetic friction is the force between two moving objects as they slide past each other. This is the force that converts movement into heat when you rub your hands together.
There's also rolling friction, which is what you have when one object rolls across the surface of another. The tires on your car, when it is moving, are held to the road by rolling friction rather than kinetic friction.
PMX just seems to have one setting, so presumably it handles all three types (if the physics engine is even capable of distinguishing between them. I honestly don't know.) with just the one number. So let's simplify things a bit. The rougher the surface is, the more friction it has. Smooth surfaces have less friction.
This is why new tires with full tread can grip the road better than bald tires that have been worn smooth. (And also why wet or icy roads are more trecherous!) Or why it's easier to push a heavy desk across smooth tile than across carpet. Lack of friction is why you need to be careful when walking on ice. Fun fact: Some of the surfaces with the lowest known coefficent of friction known are inside your own body right now. It's your joints, such as your elbows and knees. Any elderly person or person who's had joint problems will readily tell you that it's very painful when these surfaces start feeling the effects of friction.

Miku vs Friction Miku
Because friction is in play when surfaces are in contact with each other, the most obvious differences here are in Friction Miku's bangs (which rub against her head) and her tie (rub against her torso physics), though there seems to be an overall increased bounce to her physics when compared to the original Miku. Much like with Mass Miku, the differences are subtle, but there's clearly something going on.

If you have questions about MMD or PMX editor, feel free to join this Discord server to find the answers you need.

Part 1: MMD PMX Physics Settings Part 1
Part 2: MMD PMX Physics Settings Part 2
Part 3: MMD PMX Physics Settings Part 3
Part 4: You are here
Part 5: www.deviantart.com/amenrenet/a…
Conclusion: www.deviantart.com/amenrenet/a…

Credits:
Miku model by Animasa, recolors by me
Sweet Shader MME
EZGIF.com used to convert video into GIF
Post-render and post-conversion editing done with paint.net and Easy GIF Animator

Description
About This Setting
If you actually study physics, there are three different types of friction. Static friction is a force that opposes movement when you push a still object and helps to hold it in place. If you've ever had to drag heavy furnature around a building, such as your home or school, you've probably seen this one in action. It takes more force to get it started than to keep it moving. The inertia of the object hasn't changed, but the friction has. The static friction is working against you as you are trying to get it moving.
Once it's moving, now you're working with the weaker kinetic friction. Kinetic friction is the force between two moving objects as they slide past each other. This is the force that converts movement into heat when you rub your hands together.
There's also rolling friction, which is what you have when one object rolls across the surface of another. The tires on your car, when it is moving, are held to the road by rolling friction rather than kinetic friction.
PMX just seems to have one setting, so presumably it handles all three types (if the physics engine is even capable of distinguishing between them. I honestly don't know.) with just the one number. So let's simplify things a bit. The rougher the surface is, the more friction it has. Smooth surfaces have less friction.
This is why new tires with full tread can grip the road better than bald tires that have been worn smooth. (And also why wet or icy roads are more trecherous!) Or why it's easier to push a heavy desk across smooth tile than across carpet. Lack of friction is why you need to be careful when walking on ice. Fun fact: Some of the surfaces with the lowest known coefficent of friction known are inside your own body right now. It's your joints, such as your elbows and knees. Any elderly person or person who's had joint problems will readily tell you that it's very painful when these surfaces start feeling the effects of friction.

Miku vs Friction Miku
Because friction is in play when surfaces are in contact with each other, the most obvious differences here are in Friction Miku's bangs (which rub against her head) and her tie (rub against her torso physics), though there seems to be an overall increased bounce to her physics when compared to the original Miku. Much like with Mass Miku, the differences are subtle, but there's clearly something going on.

If you have questions about MMD or PMX editor, feel free to join this Discord server to find the answers you need.

Part 1: MMD PMX Physics Settings Part 1
Part 2: MMD PMX Physics Settings Part 2
Part 3: MMD PMX Physics Settings Part 3
Part 4: You are here
Part 5: www.deviantart.com/amenrenet/a…
Conclusion: www.deviantart.com/amenrenet/a…

Credits:
Miku model by Animasa, recolors by me
Sweet Shader MME
EZGIF.com used to convert video into GIF
Post-render and post-conversion editing done with paint.net and Easy GIF Animator