Physics with Falcon (and others)

Falcon wrote:

^It looks like the math involved in the above is for bullets with air resistance, which I agree has some effect on the bullet. In a...

^It looks like the math involved in the above is for bullets with air resistance, which I agree has some effect on the bullet. In a vacuum, there would be no difference.

APLMAN99 wrote:

True, but we don't live in a vacuum.......!

Falcon wrote:

People on the Moon will.

Robgvx wrote:

So, do you weigh more at the poles than at the equator? Theory being that at the equator you have centrifugal force acting against the earth’s...

So, do you weigh more at the poles than at the equator?

Theory being that at the equator you have centrifugal force acting against the earth’s gravity, but the same can’t be said for at the poles…

And if you did weigh more at the poles, how would you know? The bathroom scales would be affected by the same amount…

Falcon wrote:

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was...

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was nearly a pound for an average person, I think.

Falcon wrote:

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equator-than-at-the-north-pole/#:~:text=Yes%2C%20you%20weigh%20less%20on,as%20you%20approach%20the%20poles. I didn't think to mention before that the slight bulge at the equator lessens your...

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equa….

I didn't think to mention before that the slight bulge at the equator lessens your body weight also, since you are slightly farther away from the center of the Earth.

Falcon wrote:

^It looks like the math involved in the above is for bullets with air resistance, which I agree has some effect on the bullet. In a...

^It looks like the math involved in the above is for bullets with air resistance, which I agree has some effect on the bullet. In a vacuum, there would be no difference.

APLMAN99 wrote:

True, but we don't live in a vacuum.......!

Falcon wrote:

People on the Moon will.

APLMAN99 wrote:

True, but we don't live in a vacuum.......!

Falcon wrote:

People on the Moon will.

Log Hopper wrote:

But you can't shoot the gun on the moon.

Rawly wrote:

Shouldn’t all of the explosions in Star Wars been silent ? Actually all of the outdoor scenes being silent might be too boring to handle.

SEEMEFIRST wrote:

Why?
I'm asking because I don't know.
Radio waves move in space, why wouldn't sound waves?

SEEMEFIRST wrote:

Why?
I'm asking because I don't know.
Radio waves move in space, why wouldn't sound waves?

Robgvx wrote:

Because sound is vibrations in the air I believe.

Rawly wrote:

Shouldn’t all of the explosions in Star Wars been silent ? Actually all of the outdoor scenes being silent might be too boring to handle.

Falcon wrote:

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was...

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was nearly a pound for an average person, I think.

Falcon wrote:

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equator-than-at-the-north-pole/#:~:text=Yes%2C%20you%20weigh%20less%20on,as%20you%20approach%20the%20poles. I didn't think to mention before that the slight bulge at the equator lessens your...

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equa….

I didn't think to mention before that the slight bulge at the equator lessens your body weight also, since you are slightly farther away from the center of the Earth.

lestat wrote:

Sort of along the same lines , your head is older than your feet … unless you spend a lot of time hanging upside down .

Falcon wrote:

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was...

You most certainly do weigh more at the poles. I read the amount once and it was significant. I can't remember how much, but it was nearly a pound for an average person, I think.

Falcon wrote:

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equator-than-at-the-north-pole/#:~:text=Yes%2C%20you%20weigh%20less%20on,as%20you%20approach%20the%20poles. I didn't think to mention before that the slight bulge at the equator lessens your...

Here's a great read about it. Pretty concise, as well: https://www.wtamu.edu/~cbaird/sq/2014/01/07/do-i-weigh-less-on-the-equa….

I didn't think to mention before that the slight bulge at the equator lessens your body weight also, since you are slightly farther away from the center of the Earth.

lestat wrote:

Sort of along the same lines , your head is older than your feet … unless you spend a lot of time hanging upside down .

Rawly wrote:

Shouldn’t all of the explosions in Star Wars been silent ? Actually all of the outdoor scenes being silent might be too boring to handle.

Rawly wrote:

Shouldn’t all of the explosions in Star Wars been silent ? Actually all of the outdoor scenes being silent might be too boring to handle.

GabeM wrote:

it takes place in a galaxy far, far, way. The physics are different in their galaxy.

GabeM wrote:

it takes place in a galaxy far, far, way. The physics are different in their galaxy.

MotoTribology wrote:

Another example of sci-fi physics "just working"; when Gene Roddenberry would often be asked how the transporters worked in Star Trek, his answer was always, "very...

Another example of sci-fi physics "just working"; when Gene Roddenberry would often be asked how the transporters worked in Star Trek, his answer was always, "very well, thank you."

Falcon wrote:

Here's one that my friend, who is a rifleman, just won't believe: A bullet, upon leaving the muzzle of a gun, drops to the ground as...

Here's one that my friend, who is a rifleman, just won't believe:

A bullet, upon leaving the muzzle of a gun, drops to the ground as quickly as if you had dropped it from your hand.

Falcon wrote:

Here's one that my friend, who is a rifleman, just won't believe: A bullet, upon leaving the muzzle of a gun, drops to the ground as...

Here's one that my friend, who is a rifleman, just won't believe:

A bullet, upon leaving the muzzle of a gun, drops to the ground as quickly as if you had dropped it from your hand.

ToolMaker wrote:

While I believe that to be true, I also believe that it will take longer to "hit" the ground. If you fire a bullet level, as...

While I believe that to be true, I also believe that it will take longer to "hit" the ground. If you fire a bullet level, as the bullet travels, the ground is dropping away from the bullet and the bullet has further to drop.
TM

MotoTribology wrote:

Oh I should check that out. I like the Martian and Artemis enough that I'll give any of Weir's works a try.

Hoseclamp wrote:

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More...

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More interestingly, a bullet out of a RH twist barrel into a crosswind moving from right to left will actually climb vertically to some degree because the spin on the bullet will walk its way up the wind. The opposite would be true of a RH twist bullet shot into a crosswind from the left to right.

Hoseclamp wrote:

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More...

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More interestingly, a bullet out of a RH twist barrel into a crosswind moving from right to left will actually climb vertically to some degree because the spin on the bullet will walk its way up the wind. The opposite would be true of a RH twist bullet shot into a crosswind from the left to right.

APLMAN99 wrote:

When you say faster, do you actually mean in less distance on the x axis or faster by time?

Hoseclamp wrote:

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More...

A bullet shot into the wind will fall faster due to extra drag and vice versa when shot with the wind which seems pretty obvious. More interestingly, a bullet out of a RH twist barrel into a crosswind moving from right to left will actually climb vertically to some degree because the spin on the bullet will walk its way up the wind. The opposite would be true of a RH twist bullet shot into a crosswind from the left to right.

APLMAN99 wrote:

When you say faster, do you actually mean in less distance on the x axis or faster by time?

Hoseclamp wrote:

Hmmmm... good question. When shot into the wind it will fall in less distance for sure due to the wind pushing back on it. Time till...

Hmmmm... good question. When shot into the wind it will fall in less distance for sure due to the wind pushing back on it. Time till it drops? Im not sure.

Hoseclamp wrote:

Dang, got me thinking of more gun related physics. Typically a heavier bullet for a given caliber will require more twist to stabilize it, not necessarily...

Dang, got me thinking of more gun related physics.

Typically a heavier bullet for a given caliber will require more twist to stabilize it, not necessarily because of the weight but because of the length. See you cant make the bullet and bigger around so the heavier ones are longer to gain the extra weight. Of course there are some exceptions due to actual bullet construction/materials.

Which leads into a 1:10 twist being faster than a 1:12 twist which seems backwards untill you think about it.

Also in long range load development, "watching" the barrel move in and out of its harmonic "sweet spot" as you make the loads hotter and hotter is pretty cool. Reading about it is one thing, but seeing it in person is truely fascinating to watch.

Remind me again how a boat tail works. Haha

Hoseclamp wrote:

Dang, got me thinking of more gun related physics. Typically a heavier bullet for a given caliber will require more twist to stabilize it, not necessarily...

Dang, got me thinking of more gun related physics.

Typically a heavier bullet for a given caliber will require more twist to stabilize it, not necessarily because of the weight but because of the length. See you cant make the bullet and bigger around so the heavier ones are longer to gain the extra weight. Of course there are some exceptions due to actual bullet construction/materials.

Which leads into a 1:10 twist being faster than a 1:12 twist which seems backwards untill you think about it.

Also in long range load development, "watching" the barrel move in and out of its harmonic "sweet spot" as you make the loads hotter and hotter is pretty cool. Reading about it is one thing, but seeing it in person is truely fascinating to watch.

Remind me again how a boat tail works. Haha

m121c wrote:

For my physics III final I created a computational model of a bullet being fired to study "celebratory gun fire" after I had heard about this...

For my physics III final I created a computational model of a bullet being fired to study "celebratory gun fire" after I had heard about this being an issue.. particularly over seas where civilians get their hands on military grade weapons and will fire them in the air in celebration (say at a wedding). Don't quote me, but the news story goes that one wedding in particular ended up with 22 (?) people killed or injured from people shooting bullets straight up in the air. Can't remember really.

The model would account for different bullet/weapon types and then would log their final energy state when they would impact. Everything but a 9mm meant almost certain death... even when fired directly straight above your head meaning the bullet at some height has a point of zero velocity... although with a 9mm you had a slight survival rate depending on location, elevation, etc.

Apparently stray bullets is actually a big problem... peoples homes/roofs get hit all the time. Might seem pretty trivial but I never really thought a bullet falling would have that much force.