Instead of a parabolic path, it is an elliptical path. [[User:Anonymous5444|Anonymous5444]] ([[User talk:Anonymous5444|talk]]) 04:43, 25 May 2021 (UTC)
Instead of a parabolic path, it is an elliptical path. [[User:Anonymous5444|Anonymous5444]] ([[User talk:Anonymous5444|talk]]) 04:43, 25 May 2021 (UTC)
Below [[Escape velocity|escape velocity]] (11.2 km/s at Earth at sea level) the trajectory is an [[Ellipse|ellipse]] with one focus being at the center of Earth. Much below escape velocity the above ground part of the ellipse is very similar to a parabola, so people usually use parabola math because it’s easier. Air drag and maybe even local gravity variations like mountains cause more significant deviations from both parabolic or elliptic paths to projectiles. At escape velocity the trajectory is a parabola and at speeds exceeding escape velocity the trajectory is a hyperbola. If you’re ambitious you can include other bodies like the Moon, the Sun, other planets, your [[Mother|mom]] and use 2, 3 or n-body math. [[User:Darsie42|Darsie42]] ([[User talk:Darsie42|talk]]) 08:44, 7 November 2025 (UTC)
Below [[Escape velocity|escape velocity]] (11.2 km/s at Earth at sea level) the trajectory is an [[Ellipse|ellipse]] with one focus being at the center of Earth. Much below escape velocity the above ground part of the ellipse is very similar to a parabola, so people usually use parabola math because it’s easier. Air drag and maybe even local gravity variations like mountains cause more significant deviations from both parabolic or elliptic paths to projectiles. At escape velocity the trajectory is a parabola and at speeds exceeding escape velocity the trajectory is a hyperbola. If you’re ambitious you can include other bodies like the Moon, the Sun, other planets, your [[Mother|mom]] and use 3 or n-body math. [[User:Darsie42|Darsie42]] ([[User talk:Darsie42|talk]]) 08:, 7 November 2025 (UTC)
== Physics ==
== Physics ==
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Well, Projectile Motion is something I learned in Physics. I am trying to find out myself. So I am not sure.
Vinny P.
Projectile motion is a two dimensional motion under constant acceleration due to gravity.
182.188.168.232 (talk) 16:58, 29 December 2012 (UTC)
Added the no-references template, but that’s the least of the problems…
The Trajectory article has more details but it too is neither well-written nor well-organized, especially for someone who might consult an encyclopedia to try to learn a bit about this topic. For a standard high-school subject that one could expect students to look up here, these articles are, IMHO, really unacceptable…
For a far more detailed and accessible (I think…) treatment of this material, go to www.geogebra.org/en/upload and scroll down to and click on the /nikenuke directory. Once in there, click the /projectilePDF directory and a whole bunch of PDF papers will be available. These papers will provide a lot of analysis, some of which is beyond high-school level, but several of them should still be useful.
While in the /nikenuke directory, click on the projectile HTML files, with Java enabled, to run these simulations.
As time permits I will re-write this article, and see about the Trajectory one also.
[Sorry, I forgot to sign this the other day.] Rb88guy (talk) 14:39, 28 September 2009 (UTC)
Wow this is confusing. —Guerillero (talk) 23:33, 23 November 2009 (UTC)
there was no diagram related to projectile motin
(sehrish shafquie)30 oct 2010
Projectile motion come different in equations but each number . — Preceding unsigned comment added by 146.163.26.101 (talk) 16:26, 11 December 2012 (UTC)
What is R is the second equation? Stuff like that need to be addressed in an encyclopedia. — Preceding unsigned comment added by 206.188.63.234 (talk) 21:22, 7 August 2015 (UTC)
This article really needs some one who understands Projectial Motion to come in and explain it better and define all the variabrls, and explain all the diffrent reacurrences of V_0 The Editor’s Apprentice (talk) 05:31, 25 February 2016 (UTC)
The article does not say anything about history. The equations in the article use gravity(each equations comes into air resistance) which was a value known to Galileo and calculated by him. Vector analysis is also used but that branch of mathematics is attributed to Gibbs and Heaviside who lived much later. Who worked and formulated the projectile motion equations then????????????????????????????????????????????????????????????????????????????????
ICE77 (talk) 02:59, 15 December 2010 (UTC)
We should ignore air resistance when calculating these things. But in real air resistance greatly affects the max. height and Range. But in the article under the section of ‘The maximum distance of projectile’, it is stated: Air resistance does not affect displacement of projectile. Is it true? I studied in many books that air resistance affects both height and horizontal distance.–G.Kiruthikan (talk) 15:29, 9 April 2014 (UTC)
- air resistance will only increase with in velocity altering the rate of negative acceleration
- therefore the sentence is not correct Just curious from India (talk) 10:08, 6 June 2025 (UTC)
Can anyone work out what the Korean painting has got to do with projectile motion? The title (King Shooting Arrows) promises something to do with parabolic trajectories but I can’t see any moving arrows. By coincidence the volcano just below the centre seems to be shooting out hot rocks with parabolic trajectories, but the text doesn’t make any mention of that. —Heron (talk) 14:07, 9 December 2015 (UTC)
How are the equations for projectile motion modified if the projectile travels a distance long enough that the curve of the Earth’s surface cannot be ignored? Inkan1969 (talk) 04:17, 26 September 2016 (UTC)
There is not any apparent change in the calculation it’s just that the formula is then linked with the formulas relating to gravitational fields and such.Fire blazr (talk) 14:14, 2 September 2017 (UTC)
Instead of a parabolic path, it is an elliptical path. Anonymous5444 (talk) 04:43, 25 May 2021 (UTC)
Below escape velocity (11.2 km/s at Earth at sea level) the trajectory is an ellipse with one focus being at the center of Earth. Much below escape velocity the above ground part of the ellipse is very similar to a parabola, so people usually use parabola math because it’s easier. Air drag and maybe even local gravity variations like mountains cause more significant deviations from both parabolic or elliptic paths to projectiles. At escape velocity the trajectory is a parabola and at speeds exceeding escape velocity the trajectory is a hyperbola. If you’re ambitious you can include other bodies like the Moon, the Sun, other planets, your mom and use 3 or n-body math. Darsie42 (talk) 08:46, 7 November 2025 (UTC)
Show that there are two values of time for the same height during the course of flight of projectile and the sum of timings at which these heights are attained is equal to the total time of flight Monicakimaro (talk) 07:43, 27 May 2020 (UTC)
For a parabolic trajectory, yes. In a parabola, the two x-values at a specific y-value average out to the x-value of the vertex of the parabola, which, in our case, is the peak. The time of landing is 2 times the time of reaching the peak. Thus, it is the sum of the two time values at a y-value. Similarly, the sum of the two x-positions at a specified y-value add up to the landing distance because x-position is proportional to time (without air resistance). Anonymous5444 (talk) 05:15, 25 May 2021 (UTC)
Pruning
Was it really necessary to delete 80% of this article? It did contain quite useful explanations/formulas, the code snippet was probably too much. — Preceding unsigned comment added by 62.178.15.174 (talk • contribs)
Il looks like the zeal sizzled. In any case, both articles have a huge amount of unreferenced math, so they require a thorough beating during the merge. —Altenmann >talk 22:15, 12 October 2025 (UTC)
- What happens to Range of a projectile now? Constant314 (talk) 21:14, 13 October 2025 (UTC)
I noticed a few very important things have been removed from the article. A few months ago, it was very rich. I remember it had pretty much everything. Equations to calculate time, maximum range, height, derivations, 2D trajectories, etc. It even had projectile motion in a non-uniform gravitational field and taking into account the curvature of the planet and it had a python code to numerically simulate a projectile in air resistance. Where is all that now? Looks like someone removed 80% of the article for no reason. Anyone know why this happened and if I can find all this again somewhere else? Dimitris45 (talk) 17:31, 25 May 2021 (UTC)
- I have reverted the edits made by @LaundryPizza03 on 8 April 2021. I have restored this Wikipedia to this version: https://en.wikipedia.org/w/index.php?title=Projectile_motion&oldid=1014083173. If anybody having any problem please let us know here why? Huzaifa abedeen (talk) 02:49, 30 September 2021 (UTC)
- It’s almost certainly because almost everything is unreferenced, and given WP:OR, that means that it shouldn’t be there. However, that should be fixable if someone check the text and references from their favorite physics textbook. Klbrain (talk) 16:03, 4 October 2021 (UTC)
- Wikipedia is not a code repository. Even if referenced, that material shouldn’t be there. And the rest looks like a violation of WP:NOTTEXTBOOK and/or WP:INDISCRIMINATE to me. XOR’easter (talk) 22:40, 23 December 2021 (UTC)
- It’s almost certainly because almost everything is unreferenced, and given WP:OR, that means that it shouldn’t be there. However, that should be fixable if someone check the text and references from their favorite physics textbook. Klbrain (talk) 16:03, 4 October 2021 (UTC)
— Assignment last updated by Lzepeda12 (talk) 21:07, 26 April 2023 (UTC)
— Assignment last updated by Kmijares (talk) 22:40, 15 November 2023 (UTC)
— Assignment last updated by Ahlluhn (talk) 00:57, 31 May 2024 (UTC)
