I have a dim memory that in engineering a distinction is made between holding work such that it truly cannot move (e.g. an object held in a bench vice cannot rotate round a vertical axis, since the jaws are in the way), and holding work only by friction (e.g. an object in a vice can slide up and down, if enough force is applied).
I *think* there are jargon terms for these two notions.
Can anybody tell me what they are, or (alternatively) wether I'm misremembering badly?
BugBear