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Forum » A cannon ball is fired from a cannon horizontally
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Thread: A cannon ball is fired from a cannon horizontally

post 1549210841 04-16-2018, 07:37 AM
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Assuming no air resistance and a flat Earth, they both land at the same time.

Assuming a perfectly spherical Earth and no air resistance, the fired cannonball will land fractionally later, due to having traveled far enough horizontally before landing that the Earth's surface has curved away from it. Fire it fast enough and it goes into orbit and never lands.
post 1549211371 04-16-2018, 07:45 AM
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Originally Posted By TitusVI⏩
Many people do not understand gravity. They think gravity pulls you down. But that is far from the truth. Einstein's theory of relativity shows that its time that pulls you down. The more near you are at the core of earth the fastger time goes by. Which means if you jump up you go up because time is slower and you drop down because the time at your feet is faster and it is pulling you down. That's because every matter is moving into the future at different speeds.
All of my jizz was moving into your mums mouth at the same speed so I don't know if your theory is true.
post 1549211561 04-16-2018, 07:48 AM
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Originally Posted By melDorado⏩
Horizontal wud land at same time

Fired above horizontal will land after
Fired below horizontal will land first

Basic mechanics cmon guys
Youve given the ball zero vertical acceleration if you fire horizontal

Source believe it or not melDorado has first class honours degree in physics
The ball launched from the cannon has an x component (from the force from the cannon) + y component (from the gravitational acceleration, G) so it will obviously land later than the dropped ball which only has the gravitational acceleration and zero horizontal component.
Originally Posted By melDorado⏩
Youve given the ball zero vertical acceleration if you fire horizontal
Yes, there are no additional force exerted vertically from the cannon ball but you are wrong to say that there is no vertical acceleration. It still has the gravitational acceleration acting downward pulling the weight to the ground.
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post 1549211801 04-16-2018, 07:52 AM
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I can't believe how many idiots live on planet flat earth.
post 1549212481 04-16-2018, 08:01 AM
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some people in here dont even know wtf horizontal is....
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post 1549212701 04-16-2018, 08:03 AM
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I would have never expected it to be that close with a bullet fired from a gun. Good thread. And they say you never learn anything worthwhile on the misc...
post 1549212731 04-16-2018, 08:03 AM
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Originally Posted By AquilaConfido⏩
Well it looks like I was wrong.



Cliffs: Time in the air of projectile fired horizontally from height is only affected by vertical component of velocity, which is gravity in both fired and dropped cases.

Initial horizontal projectile speed does not matter.

Hence dropped and fired cannonball will hit the ground at same time.
Lol I guess I'm one of the dumb ones too.
Really thought time will be based from the resultant effect having x and y component on the fired one.

Good info.
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post 1549212841 04-16-2018, 08:04 AM
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same time disregarding air resistance.

/thread
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post 1549214141 04-16-2018, 08:25 AM
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Flat plane, vacuum... yes

Otherwise you can get into many factors. I’m convinced this must be a troll thread though.
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post 1549214281 04-16-2018, 08:26 AM
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Originally Posted By Kylevolution⏩
Made a diagram for you *******s who are struggling,



If the velocity of the cannonball exceeds perpendicular gravitational pull then it will
But who was horizontal?
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post 1549215461 04-16-2018, 08:40 AM
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IDK lemme google it so people on misc think erm rielly smert
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post 1549216151 04-16-2018, 08:47 AM
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Originally Posted By Kylevolution⏩
Made a diagram for you *******s who are struggling,



If the velocity of the cannonball exceeds perpendicular gravitational pull then it will
Flatten that globe out, brah, then we can science.
post 1549217371 04-16-2018, 09:04 AM
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It depends if the cannon ball is made out of 10lbs of metal or 10lbs of feathers. Because the 10lbs of metal is heavier
post 1549217491 04-16-2018, 09:06 AM
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If we're talking in physics-101 terms where everything involving projectile motion is in a vacuum, then they'll hit the ground at the same time.
post 1549217741 04-16-2018, 09:09 AM
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Same time, gravity doesn’t care if you’re moving horizontally
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post 1549217991 04-16-2018, 09:13 AM
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Originally Posted By LukeS1⏩
That's because bullets move fast enough to dodge the gravity
I laughed way too hard at this, but then even harder when AquilaPotato actually agreed LOL. holy fukc
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post 1549218061 04-16-2018, 09:13 AM
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Do you want the engineers answer or the the physicst answer.

Physicist says the same time.

Engineer asks about air resistance, spin on the ball etc
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post 1549218921 04-16-2018, 09:25 AM
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Originally Posted By melDorado⏩
Horizontal wud land at same time

Fired above horizontal will land after
Fired below horizontal will land first

Basic mechanics cmon guys
Youve given the ball zero vertical acceleration if you fire horizontal

Source believe it or not melDorado has first class honours degree in physics
This is the basic Newtonian answer.

The horizontal speed is irrelevant to the perpendicular force of gravity.

But in real life, it's waaaay more complicated. And other factors come into play
post 1549218961 04-16-2018, 09:25 AM
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Originally Posted By PTzFree⏩
Well, your honours degree left you a fukkin moron.
A cannon is about 4 feet off the ground. You drop a cannon ball from four feet I can guarantee you it's hitting the ground sooner than a cannon ball being accelerated across the ground horizontally. Is this seriously even debatable?

What OP left out because he's also a fukkin moron is a chit-ton of variables that make this a math problem. Instead, because you're both dipchits, it's a logic problem that has evaded both of you.
Originally Posted By AquilaConfido⏩
2:1 Mathematics degree here, and you're wrong. Speed matters when cannonball is fired horizontally, because F=ma.

When cannonball is dropped, equation becomes F=mg because gravity.

When fired from horizontal, acceleration must be taken into account because that will have an effect on how long the projectile will travel before it hits the ground.

Basic projectile ballistics.
Not sure if srs, hope this is trolling.


mechanical engineering degree checking in and you're both potatoes.


F=ma is true, but acceleration in the x-direction will not affect acceleration in the y-direction. For both cannonballs, the only force acting in the y-direction is gravity. They will have the same acceleration in the y-direction, and will land at the same time (excluding the difference in distance dropped due to the curvature of the earth).


edit: I see you have already been shown that. Also cringing so hard at the fact that you were being srs.
Originally Posted By Ayz33⏩
same time disregarding air resistance.

/thread
You don't even have to disregard air resistance. The air resistance in the Y-direction will be the same for both cannonballs
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post 1549219721 04-16-2018, 09:33 AM
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post 1549220081 04-16-2018, 09:38 AM
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post 1549220511 04-16-2018, 09:43 AM
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I lose so much faith in humanity every time there's a physics/mechanics/statics/dynamics thread on the misc....
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post 1549220551 04-16-2018, 09:44 AM
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Originally Posted By Jacobcapra⏩
I lose so much faith in humanity every time there's a physics/mechanics/statics/dynamics thread on the misc....
Apparently math degrees don't require basic physics classes these days.
post 1549220721 04-16-2018, 09:45 AM
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yes, in a perfect scenario (aka vaccuum) objects would land same time.
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post 1549220741 04-16-2018, 09:46 AM
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Jesus christ, there are quite a few idiots here. There are different forces of acceleration and planes.

Fire a cannon horizontally, and there is a horizontal force from the cannon. The only vertical force is gravity.

Drop it and the only force is gravity.

So for vertical component, only gravity is acting and so will hit the ground at the same time.

Where did you get your math degree from man? Jesus, it should be revoked.
post 1549220801 04-16-2018, 09:47 AM
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These are my favorite threads. In for scholarly debate
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post 1549220891 04-16-2018, 09:48 AM
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Btw its these kind of math degrees being handed out that lead to bridges being built in Florida that collapse
post 1549221081 04-16-2018, 09:50 AM
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As the cannon is fired horizontally at the same height as the other cannonball is dropped, they will reach the ground at the same time due to the gravity forces in the vertical plane. That is the vertical velocity will be the same for both cannon balls even though the projected cannonball has a higher horizontal velocity, which will result in a different horizontal displacement only.
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post 1549224771 04-16-2018, 10:31 AM
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Originally Posted By Retoaded⏩
Apparently math degrees don't require basic physics classes these days.
Actually, I really don't think they do.
Originally Posted By jakedel⏩
Btw its these kind of math degrees being handed out that lead to bridges being built in Florida that collapse
Pretty sure engineers build bridges, not math majors


lol @ miscers negging back cause they're butthurt. You earned your neg by pontificating about a topic that you don't understand, can't have armchair engineers spouting off garbage. Truth hurts, brahs
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post 1549225271 04-16-2018, 10:37 AM
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Originally Posted By PTzFree⏩
Well, your honours degree left you a fukkin moron.
A cannon is about 4 feet off the ground. You drop a cannon ball from four feet I can guarantee you it's hitting the ground sooner than a cannon ball being accelerated across the ground horizontally. Is this seriously even debatable?

What OP left out because he's also a fukkin moron is a chit-ton of variables that make this a math problem. Instead, because you're both dipchits, it's a logic problem that has evaded both of you.
Lmao


gravity will pull them both down at the same rate, the only difference is the fired cannon ball will touch down at a greater distance away. Thats all.

But thats according to a flat earth theory, If the earth in fact is round, then the dropped ball will touch down first. Where the curvature of the earth will cause the fired ball to touch down slightly after.
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