bag of holding physics

[Averis Vol]

I was wondering recently, when you put something into a bag of holding or a Haversack it goes into a different dimension right? what happens to any momentum an item would have had going in?

For example: say Hravingar the paladin has recently obtained a bag of holding and his friend stratus the dragonborn flies up high enough to reach terminal velocity and drops a cannonball into Hravingars bag of holding. Now, he jsut keeps his bag and never turns it inside out or attempts to grab the cannonball hidden in an alternate dimension until he reaches Mr.Bad the Big Red Dragon. He then chooses to turn the bag inside out and point it at the dragons scaley exposed face.

What happens? does it retain terminal velocity and shoot out at a high speed or does it just clunk onto the ground?

[MesiDoomstalker]

When he turns the bag inside out, he notices that its a regular old bag. Thinking back, he realized that Bags of Holding could still tear and, in all likelyness, the terminal velocity Cannonball ripped right through, ruining the extradimensional space and all that was inside (including the cannonball).

[Alabenson]

Well, a bag of holding's dimensional portal does not conserve linear momentum, so if speedy thing goes in, speedy thing doesn't come out.

[Laserlight]

For example: say Hravingar the paladin has recently obtained a bag of holding and his friend stratus the dragonborn flies up high enough to reach terminal velocity and drops a cannonball into Hravingars bag of holding.

This is where the DM says "Let me be sure I understand this correctly. You want your ...friend...to fly up very high, and drop a cannonball, which will reach terminal velocity, and you're going to try to catch this terminally, please note that word terminally, fast cannonball, in a bag which you are holding, but without it hitting you or the edge of the bag. Is that right?" :smallsmile:

Assuming Hravingar is silly enough to try and lucky enough to pull it off without getting killed or destroying the bag...The cannonball does some combination of the following:

It retains its velocity, which means it's moving deeper into the bag. Gonna make it hard to pull it out
Its momentum is converted to heat
Its momentum is converted to angular momentum, so it's spinning fast rather than flying fast

[LTwerewolf]

Different dimension doesn't specify gravity or air friction, so it's easy to assume it has similar both to the material plane. Ultimately after long enough it would slow down and stop.

[Hylas]

I would say no because a bag of holding is just a container which is bigger on the inside than on the outside. If you were trying to catch a cannonball with a regular bag it would be destroyed, thus, so would a bag of holding.

[Lateral]

Different dimension doesn't specify gravity or air friction, so it's easy to assume it has similar both to the material plane. Ultimately after long enough it would slow down and stop.

That's... not how air resistance works. Now, if you were saying that it should have similar air resistance to the Material Plane, but no gravity, then you'd be right.

And, by the way, I'd interpret it as simply hitting the bottom of the Haversack; the thing has a volume limit, so it's got to have an end. Either that, or it's a closed loop, in which case I'd interpret it as the thing I said above. Either way.

[Hanuman]

The falling could be solved with a warforged playing a lyr of building next to a 50 story sheer cliff, he could carve a straight shaft down the cliff and then seal the exposed side with some pitons and wood, also with the lyr.

Bag of holding and haversacks are non-dimensional (and sometimes extra-dimensional) spaces. They don't technically exist as a place, so you can't teleport or travel into one from any other location.

The walls of said space are made of bag, so if something even slightly pierces that space with the force needed to pierce the normal bag it's considered ruptured and the non-dimensional space disappears.

The limitations of a bag are at most 250 cubic feet and 60lbs.

A 6.68" diameter round shot is 42lbs, so by mass calculations you'd probably get a 7" ball for 59.9lbs.

Problem 1) Velocity may factor into weight, ruining the bag from overload.
Problem 2) No altered gravity or physics, cannonball by default goes a couple dozen feet into the bag, pierces it, and the bag is ruined from piercing.

Sorry, but yes you could shoot the cannonball out of the bag with it's gravitational velocity, but you'd need to figure out a way to freeze and redirect it's velocity regardless if it was in a bag or not, first.

[Twilightwyrm]

Bag of Holding

This appears to be a common cloth sack about 2 feet by 4 feet in size. The bag of holding opens into a nondimensional space: Its inside is larger than its outside dimensions. Regardless of what is put into the bag, it weighs a fixed amount. This weight, and the limits in weight and volume of the bag’s contents, depend on the bag’s type, as shown on the table below...
If the bag is overloaded, or if sharp objects pierce it (from inside or outside), the bag ruptures and is ruined. All contents are lost forever. If a bag of holding is turned inside out, its contents spill out, unharmed, but the bag must be put right before it can be used again. If living creatures are placed within the bag, they can survive for up to 10 minutes, after which time they suffocate. Retrieving a specific item from a bag of holding is a move action—unless the bag contains more than an ordinary backpack would hold, in which case retrieving a specific item is a full-round action.

If a bag of holding is placed within a portable hole a rift to the Astral Plane is torn in the space: Bag and hole alike are sucked into the void and forever lost. If a portable hole is placed within a bag of holding, it opens a gate to the Astral Plane: The hole, the bag, and any creatures within a 10-foot radius are drawn there, destroying the portable hole and bag of holding in the process.

Moderate conjuration; CL 9th; Craft Wondrous Item, secret chest.

Nowhere in here does it say that momentum of things going into the bag is halted, meaning that a cannonball going at terminal velocity into the bag will continue at terminal velocity once it gets inside, resulting in either a) the cannonball ripping through the other side of the bag (the description says it can be penetrated from the inside) or b) the fabric of the bag holding, and the cannonball losing all momentum as the walls of the pocket dimension simply absorb the impact. Either way, you are not going to have a speeding cannonball coming out when you open it up again.
Side Note: I suspect the idea that items in the bag go into some sort of stasis is a product of confusion with the Gloves of Storing, which puts the held item into stasis while it is shrunk. Incidentally, what is more interesting is the idea of traveling at terminal velocity with a cannonball weighing less than 20lbs in one's hands, and putting said cannonball in stasis while you are falling. Since stasis preserves chemical reactions in suspension, it may also be argued it preserves forward momentum, in which case you may be able to then simply hold up your hand once you find the BBEG, and release the item from stasis. Since it retains its forward velocity, it would shoot out of your hand in whatever direction you are aiming. Note however, it you be going at your terminal velocity, not its terminal velocity.
Post Side Note: However, due to the fact that whatever artillery you have the cannonballs for probably shoots them at a faster speed than the terminal velocity of said cannonball, you may want to simply bring along said artillery in your bag and shoot the cannonball from it once there, as doing so would get a better result. This is assuming you can live without ever seeing the look of dumbfounded surprise on the BBEG's face when a cannonball shoots at him out of your hand, which may be worth the a less powerful shot.

[Alienist]

Obviously it continues to accelerate at the rate with which it was doing so when in the bag. Gaining mass as it does so (due to mass/energy equivalency). Eventually it will increase to larger than the mass of the bag or haversack, thus rupturing it.

No?

But it makes just as much sense as the other things everyone else has been saying about it.

[TuggyNE]

Obviously it continues to accelerate at the rate with which it was doing so when in the bag. Gaining mass as it does so (due to mass/energy equivalency). Eventually it will increase to larger than the mass of the bag or haversack, thus rupturing it.

No?

But it makes just as much sense as the other things everyone else has been saying about it.

Er, what do you find nonsensical about the simple RAW answer "it pops through the bottom of the bag shortly and ruins it", as was posted earlier?

[Garwain]

I can't remember reading the laws of physics in any dnd rulebook. What happens is that you put an object in, and you retrieve it. So if you put it in gently, with force or at terminal velocity, that's no issue. Reach in an find a motionless cannonball in your hands.

for those that are putting poisoned shurikens in their bag, do so very very very slowly because otherwise it jumps out at the same speed you've put it in. See... that's just sillyness in a bag.