Streamlining is a way to help an item travel faster. Friction is nearly the exact opposite, as it will slow an item down.
All of them (though oils have less).
It can never be exactly zero, but it is close to 0.
An item dropping through the air experiences Skin Resistance. That is the turbulence created by friction on the surface of the item passing down in the air. Also there are Updrafts which will slow the item down. NOTE: These problems are not present when the item is in a Vacuum (Space.)
The surface that has the lowest friction is a wet surface, or a surface that has been oiled with light oil, or the air cushion underneath a hovercraft. Then there is the train that runs on magnetic rails, hovering above the rails without physically touching.
Streamlining is a way to help an item travel faster. Friction is nearly the exact opposite, as it will slow an item down.
Friction is considered a force because it acts on an item and causes changes, which is what a force is. Nothing would happen if the item was in an area where friction was not possible or if friction was where an object was not since they need each other to exert external effort.
Traction is a loose term describing the amount of friction an item has. Friction is a type of force.
2 is the lower number. And whether or not it is in friction (or possibly fraction) is irrelevant.
All of them (though oils have less).
Friction will cause the item in motion to heat up. It will also wear the surface away.
It can never be exactly zero, but it is close to 0.
An item dropping through the air experiences Skin Resistance. That is the turbulence created by friction on the surface of the item passing down in the air. Also there are Updrafts which will slow the item down. NOTE: These problems are not present when the item is in a Vacuum (Space.)
Diamond-like Carbon has a coefficient of friction of as low as 0.05 on polished steel.
The surface that has the lowest friction is a wet surface, or a surface that has been oiled with light oil, or the air cushion underneath a hovercraft. Then there is the train that runs on magnetic rails, hovering above the rails without physically touching.
Start your item at a the lowest possible price you can.
Friction is a result of the interactions between surfaces that are in contact, more precisely, it arises from microscopic interactions between jagged natures of surfaces. Friction is present even when an item is not moving.