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![[parent]](https://images.physicslibrary.org/images/uparrow.png) Viewing Correction to 'ballistics (2D)'
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capitalization, punctuation, use of articles, run on sentence, subscripts, spelling, superscripts by Wkbj79
Correction id: 24
Filed on: 2007-06-29 02:46:19
Status: Accepted on 2009-03-06 17:42:00
Type: Meta/Minor
Correction text:
The second sentence needs to be capitalized, and there is a comma missing. It should read something like:
"For a start, let's define a horizontal axis $x$ and a vertical axis $y$."
In the sections "The Horizontal motion", "The vertical motion", and "The 2D motion", "The" is not needed. Moreover, please make sure that the capitalization of horizontal and vertical is consistent. (As these are section names, whether horizontal and vertical are capitalized or not does not matter, so long as it is consistent.)
The following is a run on sentence:
"Assuming that the drag force is insignificant, the sum of forces along the $x$ axis $\Sigma F_x$ equals zero, and so the acceleration along the axis $a_x$ is also insignificant and so the velocity along the the axis $v_x$ is constant and equal to the projection velocity $V_i,x$"
I recommend:
"Assuming that the drag force is insignificant, the sum of forces along the $x$ axis $\Sigma F_x$ equals zero, and so the acceleration along the axis $a_x$ is also insignificant. Thus, the velocity along the the axis $v_x$ is constant and equal to the projection velocity $V_i,x$".
Also, do you mean $V_{i,x}$ instead? (That is, $x$ is part of the subscript.) Similarly, $V_i,y$ occurs later and might need to be changed to $V_{i,y}$.
In the sentence "When dealing with a constant velocity motion the following kinematic function is relevant:", please add a comma:
"When dealing with a constant velocity motion, the following kinematic function is relevant:"
In the sentence "Because the force along the $y$ axis is constant the motion along the axis is evenly acclerated and so the place of the object as a function of time $y(t)$ is:", "acclerated" is a misspelling, I would prefer the use of "position" over "place", and please add some commas:
"Because the force along the $y$ axis is constant, the motion along the axis is evenly accelerated, and so the position of the object as a function of time $y(t)$ is:"
In the final equation, please use this instead:
\[ y=y_i + (x-x_i) V_i \tan\alpha + \frac {g(x-x_i)^2}{2{v_i}^2 \cos^2\alpha}\]
That way, the exponent 2 appears slightly to the right of v_i. |
Comment from object owner vip6:
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