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Question: Acceleration / Deceleration

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#1 CraneArmy

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Posted 15 February 2018 - 01:14 PM

This has been a nagging question ive had for a while and I dont know if there is any information about this anywhere, I've asked some people and they gave me the same "I dunno" answer that I had.

I'm not sure exactly what the distinction between acceleration and deceleration is on the skill tree or in a mech's stats.
Deceleration isnt really a thing, its a misnomer.
Acceleration is the result of transferring momentum from one body to another and its measured regardless of speeding up or slowing down.

Obviously this is a game, so the only thing I really care about is clearing up the ambiguous labels.

a) Is acceleration always the change of speed in the forward direction, and deceleration the change of speed in the backward direction?
Or
b ) Is acceleration always the increase of speed in any direction, and deceleration always the decrease of speed in any direction?
Or
c) Is acceleration always the change of speed in any direction while speed is forward, and deceleration is the change of speed in any direction while speed is below zero?

I've always assumed its "A", but I really dont know.

Posted Image
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edit: removed unintended emoji
edit: added picture

Edited by CraneArmy, 15 February 2018 - 01:54 PM.


#2 FupDup

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Posted 15 February 2018 - 01:16 PM

It's A.

#3 mogs01gt

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Posted 15 February 2018 - 01:25 PM

View PostFupDup, on 15 February 2018 - 01:16 PM, said:

It's A.

agreed

#4 CraneArmy

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Posted 15 February 2018 - 02:30 PM

View Postmogs01gt, on 15 February 2018 - 01:25 PM, said:

agreed

View PostFupDup, on 15 February 2018 - 01:16 PM, said:

It's A.

has anyone tested this. I would have thought it was a), I think b ) makes more sense to me though.


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edit: emoji again

Edited by CraneArmy, 15 February 2018 - 02:31 PM.


#5 Relishcakes

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Posted 15 February 2018 - 02:36 PM

View PostCraneArmy, on 15 February 2018 - 02:30 PM, said:

has anyone tested this. I would have thought it was a), I think b ) makes more sense to me though.


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edit: emoji again

I think B is real world....but i think in engine terms A is the correct way to put it.

#6 Maxxi

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Posted 15 February 2018 - 03:13 PM

Second law of Newton: F=ma

where: F= Force, m=mass and a=acceleration.

The first law of Newton says that one object would not change it direction, unless you apply a force. The force is the action and the acceleration is the consecuence. You can understand better if you take an X amount of force to accelerate a mech to top speed and use the same force to stop it to zero. Increase F, and you increase acceleration. The change of acceleration depends of the mech's direction only. Foward or backward, you have to apply a force to change the velocity through time (that's the definition of acceleration (a=dv/dt).

#7 El Bandito

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Posted 15 February 2018 - 06:38 PM

I thought it was B. I am pretty sure it is B.

#8 Peter2k

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Posted 15 February 2018 - 07:28 PM

B

It may be counter intuitive to say one accelerates backwards, but acceleration and deceleration just mean add speed / reduce speed
That it is a forward or backward motion doesn't factor into the word does it?

In skill tree terms, acceleration is how fast you can increase your walking speed, either forwards or backwards, and deceleration is how fast you "brake", e.g. how fast you can stop on a dime

Edited by Peter2k, 15 February 2018 - 07:28 PM.


#9 CraneArmy

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Posted 15 February 2018 - 08:32 PM

View PostPeter2k, on 15 February 2018 - 07:28 PM, said:

B

It may be counter intuitive to say one accelerates backwards, but acceleration and deceleration just mean add speed / reduce speed
That it is a forward or backward motion doesn't factor into the word does it?

In skill tree terms, acceleration is how fast you can increase your walking speed, either forwards or backwards, and deceleration is how fast you "brake", e.g. how fast you can stop on a dime

in terms of physics, deceleration isnt a thing at all.
acceleration is a vector quantity, meaning that its a direction and an amount. Any change of speed or direction would be considered acceleration in the direction the accelerating force is being applied, regardless of the object's velocity.

#10 Peter2k

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Posted 15 February 2018 - 09:56 PM

View PostCraneArmy, on 15 February 2018 - 08:32 PM, said:

in terms of physics, deceleration isnt a thing at all.
acceleration is a vector quantity, meaning that its a direction and an amount. Any change of speed or direction would be considered acceleration in the direction the accelerating force is being applied, regardless of the object's velocity.

While it sure sounds smart, I'm not sure how you would apply it in terms mortals would understand, especially in an non English environment coupled with dev's not spending a dime on localization.

Cars break to reduce momentum, Mechs....? Step slower? Apply acceleration opposite to the momentum?

Deceleration is also in the dictionary, having a meaning of "reduction of speed or rate"
Btw
The question was, what does acel and decel mean in skill tree terms, as they're 2 separate things in the tree, not if it's a force recognised in physics

Also
I learned mathematicians can calculate all kinds of fancy things, but Phyisicsts keep it in the real and applicable
Better keep it real in real life terms when someone asks for clarification on Ingame terminology :D

Edited by Peter2k, 15 February 2018 - 10:09 PM.


#11 CraneArmy

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Posted 16 February 2018 - 01:20 PM

View PostPeter2k, on 15 February 2018 - 09:56 PM, said:

While it sure sounds smart, I'm not sure how you would apply it in terms mortals would understand, especially in an non English environment coupled with dev's not spending a dime on localization.

Cars break to reduce momentum, Mechs....? Step slower? Apply acceleration opposite to the momentum?

Deceleration is also in the dictionary, having a meaning of "reduction of speed or rate"
Btw
The question was, what does acel and decel mean in skill tree terms, as they're 2 separate things in the tree, not if it's a force recognised in physics

Also
I learned mathematicians can calculate all kinds of fancy things, but Phyisicsts keep it in the real and applicable
Better keep it real in real life terms when someone asks for clarification on Ingame terminology Posted Image

Ya, I'm on board. I'm not suggesting anything be applied in game, all I'm looking for is a clarification in terms, currently it is ambiguous..

So to get you on board with the baseline premise that the idea of "deceleration" is not well explained in game (or the dictionary for that matter) II have a question for you.

If you are at 0 KPH, and you hit the 'S' key to move backwards, are you now accelerating or decelerating?
Depending on your point of view it could be either.
The speed you are moving away from where you started is getting faster (ie, accelerating). but you could also say that according to your dictionary definition, you are reducing your speed from 0kph to -50kph (ie "reduction of speed rate" - decelerating).

Again I'm not asking for any changes to the game, I dont care. I'm just not quite sure what deceleration is supposed to mean in game. Depending on the point of view of the devs it could mean different things.

#12 Khobai

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Posted 16 February 2018 - 01:43 PM

pretty sure its A

acceleration is increasing speed going forward
deceleration is increasing speed going backwards

Quote

Deceleration isnt really a thing, its a misnomer.


deceleration is definitely a thing. thats why theres a word for it. deceleration is whenever opposing forces causes your rate of speed in a given direction to decrease. usually friction or air resistance is that opposing force.

although its meaning is misused in MWO.

a car going in reverse for example is not decelerating, its accelerating backwards.

a car slamming on its brakes is decelerating though.

but the closest thing to brakes in MWO is getting stuck on one of those tiny assault mech stopping pebbles.

Edited by Khobai, 16 February 2018 - 03:05 PM.


#13 CraneArmy

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Posted 16 February 2018 - 02:05 PM

View PostKhobai, on 16 February 2018 - 01:43 PM, said:

deceleration is definitely a thing

although its meaning is misused in MWO.

a car going in reverse for example is not decelerating, its accelerating backwards.


deceleration is a thing in the game, Its a thing people say, but it doesnt have any rigorous meaning in real life. your point about the car illustrates this perfectly. People might say this is deceleration, but it is also acceleration. Deceleration is just acceleration in a rearwardish direction, its not well defined.

All deceleration is acceleration.

Again, I'm not here to torture that point, I'm just looking for what it means in game.
Most people seem to agree its either A or B.

Edited by CraneArmy, 16 February 2018 - 02:07 PM.


#14 Khobai

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Posted 16 February 2018 - 02:06 PM

Quote

People might say this is deceleration, but its also acceleration. Deceleration is just acceleration in a rearwardish direction, its not well defined.


it is well defined though.

deceleration is the term used to describe a decrease in your rate of speed caused by an opposing force.

the term describes a specific form of acceleration thats slowing you down.

there is nothing unclear, ambiguous, or confusing about that definition.


the reason the term exists is because if people always described objects as accelerating, It would be ambiguous what direction it was accelerating in (is it speeding up, slowing down?)

if the word decelerate didnt exist, and someone said "that train is accelerating"

wtf does that mean? is the train speeding up? using its brakes to slow down? both are correct but its ambiguous.

Edited by Khobai, 16 February 2018 - 03:08 PM.


#15 Koniving

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Posted 16 February 2018 - 02:09 PM

....People saying A, please tell me you're trolling right?

(Edit: Could have sworn it was 400%, but was 200%.)
In the past when the Pretty baby had a special quirk for bad deceleration on release as a fluff tidbit about it being unmanueverable in addition to 200% torso twist speed (as a fluff tidbit about Danielle's ability to make it do all kinds of things), it had the side effect of allowing it to climb incredible slopes of up to 50 degrees with little difficulty without hill climb related quirks, able to continue to climb up to the top spires of the Tourmaline Desert long after no one else could until this was removed in the quirkening. This did require the turn climb turn climb method, but since the rate of slowing down was significantly reduced the result was pretty sweet.

Quoted from Pr8dator here.

Quote

Not a competitive mech. In fact, it is the only hero mech that has unique defects (25% lesser deceleration) introduced into it without any unique loadout possibility.


It has never had rapid reverse as a result.

As the only mech to have ever had that attribute attached to it long before "Quirks" were a common thing, if "A" were correct, its greatest trait could have been derogatory WWII French jokes as the only thing it would have been considered good at is retreating while firing.

Climbing slopes higher than your means causes your mech, in PGI's own words, to decelerate.
The hill climb module reduces the rate of deceleration from climbing hills.
The nodes do the same. Though their choice of wording is suspect.
Posted Image

In actuality, unless stopping on a dime is important, it is probably interesting to note that you will come to a stop even faster when trying to climb a hill than if you did not take hard brake nodes.

By definition, the application of the brake decelerates.
make a moving vehicle slow down or stop by using a brake.
"drivers who brake abruptly" synonyms: slow down, slow, decelerate, reduce speed, stop

"she braked at the traffic lights"
The definition of deceleration

de·cel·er·a·tion

dēˌseləˈrāSH(ə)n/

noun
noun: deceleration; plural noun: decelerations



  • reduction in speed or rate.
    "speed brakes enable the aircraft to carry out rapid deceleration"


Deceleration nodes, when maxed out, allow a Locust to stop almost instantly, where without the nodes the mech is not able to perform the same task.
And yet, taking exclusively deceleration quirks will not increase its reverse speed.


Edited by Koniving, 16 February 2018 - 02:32 PM.


#16 CraneArmy

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Posted 16 February 2018 - 02:09 PM

View PostKhobai, on 16 February 2018 - 02:06 PM, said:


it is well defined though.

deceleration is the term used to describe a decrease in your rate of speed caused by any opposing force.

there is nothing unclear, ambiguous, or confusing about that definition.

see

Quote


So to get you on board with the baseline premise that the idea of "deceleration" is not well explained in game (or the dictionary for that matter) II have a question for you.

If you are at 0 KPH, and you hit the 'S' key to move backwards, are you now accelerating or decelerating?
Depending on your point of view it could be either.
The speed you are moving away from where you started is getting faster (ie, accelerating). but you could also say that according to your dictionary definition, you are reducing your speed from 0kph to -50kph (ie "reduction of speed rate" - decelerating).


#17 Koniving

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Posted 16 February 2018 - 02:11 PM

So if you accelerate to go faster, the everyday use is the assumption that you speed up.

If you accelerate to go slower, both scientifically and in every day vernacular, it is known as "Deceleration."
You do not decelerate to increase speed as by definition it is acceleration to slow down.
Though you can accelerate to reduce speed.

#18 Chris Lowrey

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Posted 16 February 2018 - 02:16 PM

It's B.

Acceleration is any time you are "gaining" speed over the current speed you are going. Doesn't matter if its in a forward or reverse direction.

Deceleration is anytime you are attempting to "reduce" speed from your current velocity and get it closer to zero.

Think of it like driving a car. Your Gas peddle is going to accelerate you regardless of if you are in first gear or reverse gear. Your brake is still going to decelerate your car down to zero regardless of the direction it is moving in. And you don't simply hold down on the brake pad to flip the car into reverse.

#19 CraneArmy

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Posted 16 February 2018 - 02:22 PM

View PostChris Lowrey, on 16 February 2018 - 02:16 PM, said:

It's B.

Acceleration is any time you are "gaining" speed over the current speed you are going. Doesn't matter if its in a forward or reverse direction.

Deceleration is anytime you are attempting to "reduce" speed from your current velocity and get it closer to zero.

Think of it like driving a car. Your Gas peddle is going to accelerate you regardless of if you are in first gear or reverse gear. Your brake is still going to decelerate your car down to zero regardless of the direction it is moving in. And you don't simply hold down on the brake pad to flip the car into reverse.

Thanks chris!
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Edited by CraneArmy, 16 February 2018 - 02:23 PM.


#20 Koniving

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Posted 16 February 2018 - 02:36 PM

View PostKhobai, on 16 February 2018 - 02:06 PM, said:

but one thing is for sure. PGI's definition of the word deceleration is all sorts of wrong.

Except it wasn't.
It just slows down.

It doesn't accelerate backwards.
Posted Image

As it was B. You decelerate to slow down.
You accelerate to go faster (in EITHER direction when stopped or to increase speed in a given direction; the "acceleration" quirk/skill node doesn't apply when slowing down as that's where the deceleration quirk/node kicks in.)

Edited by Koniving, 16 February 2018 - 02:37 PM.






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