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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 1549203941 04-16-2018, 05:04 AM
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#31
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Originally Posted By PowerRanger⏩
At the same time you drop a cannon ball of the same weight from the same height. Which cannon ball will hit the ground first?
Impossible to answer. You didn't stipulate whether the ground was level or not
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post 1549204031 04-16-2018, 05:06 AM
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Originally Posted By AquilaConfido⏩
Are you kidding me?

Fuk me a bunch of dumbasses ITT.

Do this experiment.

Fire a M1911 handgun horizontally, and at the same time drop a bullet from same height. Guarantee you the bullet dropped will hit the ground first.

Basic projectile ballistics.
That's because bullets move fast enough to dodge the gravity
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post 1549204051 04-16-2018, 05:07 AM
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Originally Posted By ClaudeGiroux⏩
depends if the earth is flat
This is the crux of it really, which is why the question is so complicated
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post 1549204081 04-16-2018, 05:08 AM
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Originally Posted By LukeS1⏩
That's because bullets move fast enough to dodge the gravity
Which is exactly my point, speed of the projectile matters.
post 1549204101 04-16-2018, 05:09 AM
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Originally Posted By ClaudeGiroux⏩
depends if the earth is flat
Yeah this, cos if it goes past the end of the earth then it'll never hit the ground
post 1549204301 04-16-2018, 05:14 AM
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Same time.

/Thread
post 1549204361 04-16-2018, 05:15 AM
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Originally Posted By AquilaConfido⏩
Which is exactly my point, speed of the projectile matters.
But whats the speed at which gravity can no longer act? does it depend on the size of the object? I assumed because a cannon ball is large it would be hard to evade forces
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post 1549204431 04-16-2018, 05:17 AM
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Originally Posted By LukeS1⏩
But whats the speed at which gravity can no longer act? does it depend on the size of the object? I assumed because a cannon ball is large it would be hard to evade forces
Doesn't depend on size of object, since both fired and dropped objects are same mass. Only thing that matters is speed of projectile.
post 1549204751 04-16-2018, 05:26 AM
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I think same time, ignoring air resistance and only if you are not near the earth's edge
post 1549204911 04-16-2018, 05:32 AM
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Originally Posted By AquilaConfido⏩
Doesn't depend on size of object, since both fired and dropped objects are same mass. Only thing that matters is speed of projectile.
Are you suggesting that objects of different mass fall at statistically significantly different rates?

Note, once the projectile leave the muzzle of the cannon there is no further acceleration due to propulsion gasses - literally the only forces acting on it are viscous drag as a result of its wind speed and mg as a result of gravitational acceleration. In the z axis (direction of gravity) both the dropped cannonball and the fired one start with 0 z velocity and accelerate at g (9,81m/s^2 give or take). x/y vel will not effect the time taken to reach the ground.

That said. only an idiot will fire a cannon (or any firearm for that matter) purely horizontally for exactly this reason. That's why your rear sight is adjustable for elevation in the first place - it alters the angle with respect to horizontal that you fire to increase flight time (and as a result range) by making the bullet fly parabolically rather than horizontally.
post 1549204931 04-16-2018, 05:32 AM
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Originally Posted By Mr
They hit at the same time?
Originally Posted By superfunk⏩
Both hit at the same time
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
Correct
post 1549204951 04-16-2018, 05:33 AM
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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.
f = mg and ma in the vertical direction in both cases. Acceleration in the vertical direction is only gravity so ma = mg.
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post 1549205041 04-16-2018, 05:36 AM
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They hit at the same time, wtf is with all the drama in this thread, I thought most people knew this, learned this in high school
post 1549205241 04-16-2018, 05:41 AM
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same time. the vertical forces acting on both are the same
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post 1549205371 04-16-2018, 05:44 AM
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same time.
source: 7th grade physics.
alternate source: mythbusters
post 1549205391 04-16-2018, 05:44 AM
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theres not enough info to say. will the cannonball fly like a curveball? spin? get lifted by air due to spinning? if in vacuum then both drop at the same time
post 1549206011 04-16-2018, 06:05 AM
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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.
post 1549206061 04-16-2018, 06:05 AM
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There is an article/mythbusters on this....

google:

mythbusters-bringing-on-the-physics-bullet-drop/

cliffs: the shot bullet drops last due to air resistance

Edit : To the guy above ^^ I had been taught that the Y-axis maintains is the same velocity for both, so they both land at the same time in theory - however in practice, due to wind resistance, it doesn't quite work.
post 1549206371 04-16-2018, 06:12 AM
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Same time



post 1549206981 04-16-2018, 06:27 AM
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The cannonball will never take off from the runway
post 1549207491 04-16-2018, 06:39 AM
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Lol cant tell if trolls or morons itt. In a vaccum both would hit at the same time erry time. On earth air resistance and lift come into play which will effect results.
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post 1549207801 04-16-2018, 06:45 AM
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post 1549207851 04-16-2018, 06:46 AM
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just lol at *******s that think gravity is real
Don't hit at all if it is honorably possible to avoid hitting; but never hit softly.
post 1549208051 04-16-2018, 06:50 AM
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same time in a vacuum. who the fuk knows otherwise.

thread over morans
post 1549208141 04-16-2018, 06:51 AM
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Originally Posted By SwimToTheMoon⏩
]pls leave the math/physics to the men thx
Actually he’s right. Look on YouTube, experiment is done in high school physics courses.
post 1549210231 04-16-2018, 07:25 AM
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Originally Posted By PowerRanger⏩
At the same time you drop a cannon ball of the same weight from the same height. Which cannon ball will hit the ground first?
They would land at the same time, even if the balls had different densities/weight.
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post 1549210641 04-16-2018, 07:32 AM
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the one out the cannon obviously because it had a greater initial acceleration
post 1549210681 04-16-2018, 07:33 AM
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depends on the cannon ball's privilege
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post 1549210781 04-16-2018, 07:36 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
Strong UK education.
post 1549210831 04-16-2018, 07:37 AM
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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.
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