Talk:Linear motion

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Are the jokes about toddle's head etc. really necessary? 62.137.134.96 (talk) 09:10, 22 October 2008 (UTC)Reply

That was vandalism, and has been reverted. Pagrashtak 15:44, 22 October 2008 (UTC)Reply

It would be wise to start out in discussion motion by first explaining the existence of a location point of reference or (Point of origin) concept before the property of motion is begun to be explained. So first we have a particle at rest at a location. And then we have motion. And the dimensions of the motion are related to the point of origin. Then, after Linear motion, which is 1 dimensional, you can advance to 3 dimensional motion without confusion.WFPM (talk) 18:43, 23 August 2010 (UTC)Reply

Whereas it con be argued that most Wiki articles start out too complicated, in this case it can be argued that this article starts out too simple! It accordingly would be in order to start out by explaining the rationale of an orthographic graphing system for graphing a distance versus time measuring system and to define the direction of the co-ordinates as being "x" or "s" as the abscissa, for the distance and as "t" the time co-ordinate, before getting into the mathematical equations of the process. Otherwise, the reader is going to start out thinking the explanation is ambiguous at the beginning, and it certainly is not going to get simpler as it goes along.WFPM (talk) 21:59, 10 September 2010 (UTC)Reply

In the section about acceleration the statement should be that the acceleration is the instantaneous change in velocity. And it is interesting that nobody is interested in the rate of change in the acceleration value evidently because we haven't found a physical process requirement for it.WFPM (talk) 18:26, 14 March 2012 (UTC)Reply

You're not familiar with Jerk (physics)? Dicklyon (talk) 18:38, 14 March 2012 (UTC)Reply

Guess not. Do I need to know it for some purpose?WFPM (talk) 22:35, 14 March 2012 (UTC)Reply

Interesting article. Thank you for the reference.WFPM (talk) 22:42, 14 March 2012 (UTC)Reply

Is it possible to fit the physical properties of the "jerk" into the generalized equation for translation:

      S = S(zero) + (V1 x t)  + (a x t^2)/2 + ?. Of course that's for constant acceleration.WFPM (talk) 16:48, 18 March 2012 (UTC)Reply

I added some elements to the table to make it include exactly what is usually mentioned in first year college-based physics textbooks. This page ("Linear motion") is a strange place for this table, but it must get visited often because the google keywords "wiki linear rotational motion" get me to this page.

In contrast, the more appropriate title, Linear-rotational_analogs, seems to have too much material to be pedagogically useful.--guyvan52 (talk) 06:08, 10 July 2014 (UTC)Reply

It seems this could be cleaned up, just some improvements in the wording. I'm not technically qualified to pass on this.

"There are two types ...." and the types are named, "rectilinear" and "curvilinear". Then the next sentence starts talking about "linear", and this noted earlier as "also called", but the difference would be confusing.

As far as "curvilinear" is concerned, that's the only place in the article that word appears. In the second Displacement paragraph, it seems to be equated with "rotational". Again, let's match the terms.

The language following this, "The displacement of an object cannot be..." as far as I know (non-physicist here) applies to both types, so should be a separate paragraph. Lontjr (talk) 11:57, 14 May 2016 (UTC)Reply

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The measurement units listed for acceleration, jerk, and jounce are incorrect. They are written as if they are some power of a reciprocal millisecond instead of meter times a power of a reciprocal second. The rules of usage for SI require that the product of two units be expressed explicitly by a space or centered dot between consecutive unit factors. For acceleration the unit is m s⁻² or m⋅s⁻² or m/s², not ms⁻². For jerk the unit is m s⁻³ or m⋅s⁻³ or m/s³, not ms⁻³. For jounce the unit is m s⁻⁴ or m⋅s⁻⁴ or m/s⁴, not ms⁻⁴. As a unit, m juxtaposed with s [no intervening space nor centered dot] is required to be interpreted as millisecond. The measurement unit for velocity and speed is done correctly. 2603:9001:700:2E96:244C:F368:7E36:8E30 (talk) 16:50, 19 July 2022 (UTC)Reply

Thanks for drawing those errors to our attention. In 3 places I have separated the m and the s using a period. Perhaps someone else can change my periods into centered dots. Dolphin (t) 05:12, 20 July 2022 (UTC)Reply

The following comment was inserted into the article on 24 December from IP address 128.118.7.108.

”I think Wiki is wrong on this definition of average speed. Since speed is a scalar, the average speed is the integral of speed over time divided by total time interval. E.g., If a car drives around in a circle at 10 kph and returns to the starting point, its average velocity is zero. But its average speed is 10 kph.”

I will erase it from the article. Dolphin (t) 01:12, 25 December 2022 (UTC)Reply

This article was the subject of a Wiki Education Foundation-supported course assignment, between 13 February 2023 and 12 June 2023. Further details are available on the course page. Student editor(s): Kbalagna, Zrivera5, Bdowell3 (article contribs). Peer reviewers: SudoNeo, Jalenlthomas.

— Assignment last updated by Lzepeda12 (talk) 21:07, 26 April 2023 (UTC)Reply

This article was the subject of a Wiki Education Foundation-supported course assignment, between 21 August 2023 and 16 December 2023. Further details are available on the course page. Student editor(s): Saul Shad (article contribs). Peer reviewers: Suidrew, Djoung, Noahchavez.

— Assignment last updated by Djoung (talk) 01:15, 17 November 2023 (UTC)Reply

V→_f=V→_i+a→t

d→=V→_it+½a→t²

V→²_f=V→²_i+2a→*d→

d→=½(V→_f+V→_i)t

In equations, vectors were often represented as bolded letters to distinguish them from scalars. With the appropriate notation disclosed in recent years, arrows are now placed on top of letters to represent vectors. Vectors are mathematical objects that are comprised of a magnitude and direction. The arrow on top of a letter indicates the direction in which the vector is pointing. Additionally, the length of the arrow corresponds to its magnitude.

Reference Source: 1.1: Vectors.” Physics LibreTexts, 30 June 2022, phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Classical_Mechanics/1%3A_Motion/1.1% Saul Shad (talk) 00:08, 13 December 2023 (UTC)Reply

In this article's introductory section, there is the following sentence.

"In linear motion, the directions of all the vectors describing the system are equal and constant which means the objects move along the same axis and do not change direction."

However, in the linear motion defined as the one-dimensional motion, depending on a net force applying on an object under consideration, the direction of a vector description the object motion, like velocity, can be reversed. Is this sentence valid? (I.e., are all vectors describing a system in the linear motion really constant?) Goodphy (talk) 09:06, 22 November 2025 (UTC)Reply