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2022-07-21T08:33:18Z

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scratch>Jvvg в 21:48, 6 июня 2022

2022-06-06T21:48:47Z

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{{Wiki Standards|Writing is difficult to understand|date=December 2020}}
'''Projectile motion''' is a form of motion experienced by an object when it is launched near the surface of the Earth and moves along a curved path under the force of gravity. This path of motion can be shown by a parabola (symmetrical curved line), or by a straight line when launched straight upwards.

==Forms of Use==
Projectile motion can be used to calculate the path and distance an object travels on a 2D plane (left, right, up, down). These calculations can be used to create realistic [[Game Projects|games]], [[Simulation Projects|simulations]], [[Animation Projects|animations]], and more.

==Tutorial==

===Equations===
When calculating projectile motion, it is good to understand what equations to use, and why they are used. The two values the user will input are a speed and an angle. With these two inputs, the first variable that needs to be found is Time. The equation used to represent time is:

t = (vfy - viy) / ag

(time = [final velocity in y direction - initial velocity in y direction] / gravity)

After time has been solved, Distance Traveled needs to be solved. The equation used to solve the distance is:

Δx = vix * t

(displacement in x direction = initial velocity in x direction * time)

But, before these equations can be solved, the velocities in the x direction and y direction need to be found. This will be done after the user inputs the initial velocity and angle launched.
{{note|Gravity is always -9.81 m/s2}}

===Scripts===
Before anything can be done, these variables need to be created:
<scratchblocks>
(init vel)
(angle)
(init vel x)
(init vel y)
(final vel y)
(time)
(displacement)
</scratchblocks>

At the start, they need to be given some values:
<scratchblocks>
when green flag clicked
ask [Initial Launch Speed] and wait
set [init vel v] to (answer)
ask [Launch Angle] and wait
set [angle v] to (answer)
</scratchblocks>

Now that an initial velocity and angle have been given, the velocities in the x direction and y direction need to be calculated:
<scratchblocks>
set [init vel x v] to ((init vel)*([cos v] of (angle)))
set [init vel y v] to ((init vel)*([sin v] of (angle)))
set [final vel y v] to ((0)-(init vel y))
</scratchblocks>

With these values set, time and distance traveled can be calculated:
<scratchblocks>
set [time v] to (((final vel y)-(init vel y))/(-9.81))
set [displacement v] to ((init vel x)*(time))
</scratchblocks>

Once these values have been calculated, there are many different things that can be done with them. An example is a projectile launch simulation. A realistic game (provided other accurate physics is included).

==See Also==
* [[Projectile Motion]]
* [[Projectile Engine]]

[[Category:Physics Tutorials]]
[[Category:Scripting Tutorials]]

Projectile Simulation - История изменений

Patarakin: 1 версия импортирована

scratch>Jvvg в 21:48, 6 июня 2022