Expanding on Angelone's page reference, etc.:
QUOTE (Mystweaver @ Sep 6 2010, 07:01 AM)

It creates a physical wall that if broken through the spell is also broken. In the same instance, if the barriers force is reduce by an attack it comes back up to its full force at the beginning of the next combat turn.
Per the barrier rules, barriers can be either compromised (opening a hole) or weakened without any associated hole. The weakening reduces Barrier Rating; it is this damage which is restored if the barrier survives to the next turn. If a hole is opened, the spell ends.
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So if I have a force 6 physical barrier around my character/ team, and we are shot at by a heavy pistol, does the first 9M bullet destroy the barrier? I can't seem to find the correct mechanics for how this works.
Per barrier rules, Breaking Through (p125), barrier rating is doubled against firearms for the purpose of damaging the barrier. Thus, your Force 6 Physical Barrier (assuming no extra successes) has a base barrier rating of 6, doubled to 12. 9 is greater than 1/2 barrier rating but not greater than barrier rating, so the barrier rating is reduced by 1 to 5 (this one's tricky, at the start of this post I was thinking in terms of it being reduced to 11). A second shot from a heavy pistol in the same turn will reduce barrier rating to 4 (5 < 9 < 10), and when it absorbs the third shot it comes down (8 < 9).
Note that every two successes on the Sorcery test increase the barrier rating by 1, so while the TN's a bit high to expect it you may well end up with BR 7 and an extra pistol-shot worth of soaking power.
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Also, is it moveable? Or is it centered on the location it is cast?
This turns out to be a tricky question, since Physical Barrier doesn't state in its description that it is an Area spell, but the Spell Table in the back of MitS lists it as one. Consequently, as an Area Manipulation spell that is Sustained, it falls under the rules on MitS p51, so you can relocate a Physical Barrier to a new location within line of sight with a Complex Action.
~J