Pressure and Friction, Pressure and Friction

[frequentreader]

A friend and I are having a debate about the validity of the following statements (some are basically duplicates of eachother). Would somone please tell me if these statements are true or false, and why. Thank you.

S1: Movement under pressure implies friction.
S2: In the absence of pressure, a moving substance experiences no friction.
S3: Under pressure a substance cannot move without experiencing friction.
S4: If a substance is under pressure, when it moves it will experience friction.
S5: If a substance moves and does not experience friction, then it is not under pressure.

[frequentreader]

As a quick update to my question. I am specifically asking about motion orthogonal to the force vector imparting the pressure on the substance.

Also, I have read about the pressure imparted by EM radiation, as used in a solar sail, so I wonder, if an object under pressure from EM moves orthogonally to the pressure, does it experience some sort of friction? If this is not called friction, is there another name for some type of resistance that the object might experience, if indeed it does experience resistance.

How about a superfluid in a magnetic confinement chamber? Does it, the superfluid, experience pressure? If so, when it moves, does it experience friction - not viscosity, but friction against the 'walls' of the container?

[frequentreader]

Interesting article on quantum friction

http://www.sst.ph.ic.ac.uk/photonics/pdf/pendry97a.pdf