acceleration question (for techy type bods really)
#42
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BIG difference between continuing to go uo, and accelerating!
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
#43
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Originally Posted by alistairolsen
BIG difference between continuing to go uo, and accelerating!
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
have another go, see if you can contradict yourself even more
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#44
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Originally Posted by Matt J
Originally Posted by alistairolsen
BIG difference between continuing to go uo, and accelerating!
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
have another go, see if you can contradict yourself even more
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
to continue to accelerate it would require a force, if this happened it would also result in it moving faster just after it left your hand, then when it left your hand which is NOT the case.
if it leaves your hand at 9.8m/s, and gravity imposes an acceleration of -9.8m/s^2 then it will continue upwards for one second, until its velocity is zero, at which point it will continue accelerating at the same rate, but will now be travelling in a different direction!
so saying that it continues upwards is of NO consequence to whether it is still accelerating or not!
#46
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Originally Posted by alistairolsen
Originally Posted by Matt J
Originally Posted by alistairolsen
BIG difference between continuing to go uo, and accelerating!
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
It goes up, but more and more slowly till eventually it peakes and begins to come down, but it is decellerating from when it leaves your hand.
![Confused](https://passionford.com/forum/images/smilies/icon_confused.gif)
have another go, see if you can contradict yourself even more
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
to continue to accelerate it would require a force, if this happened it would also result in it moving faster just after it left your hand, then when it left your hand which is NOT the case.
if it leaves your hand at 9.8m/s, and gravity imposes an acceleration of -9.8m/s^2 then it will continue upwards for one second, until its velocity is zero, at which point it will continue accelerating at the same rate, but will now be travelling in a different direction!
so saying that it continues upwards is of NO consequence to whether it is still accelerating or not!
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#49
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Jesus....all this crap on this thread
Your acceleration will of course start to decrease when you lift off.
Ie, the ball leaves your hand doing 20m/s, it will immediately when released decelerate at about 10m/s, so after ~ 2 seconds its velocity will be zero.
Ask a school kid for their science book and be amazed
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
Your acceleration will of course start to decrease when you lift off.
Ie, the ball leaves your hand doing 20m/s, it will immediately when released decelerate at about 10m/s, so after ~ 2 seconds its velocity will be zero.
Ask a school kid for their science book and be amazed
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#50
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Originally Posted by alistairolsen
well read the thread before you act like a cunt then mate
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#51
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Some people need to start to realise the difference between "the rate of change of speed" (IE acceleration/Deceleration) and speed its self.......
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#52
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I can't beleive anyone believes the accelration could continue without ENERGY being imparted by the car's engine.
The instant you either lift foot off gas or dip clutch, you start to deccelerate, might be a slight amount but it cannot be any other way, otherwise you could merely accelrate to speed dip the clutch and keep going at 60 mph for hundreds of miles, you could in space as there is little gravity and no atmosphere.
Basic theory, "for every action there is an equal and opposite reaction".
A car has NO potential energy only energy which you provide with the engine by burning fuel.
Any ball thrown in the air will start to deccelerate immediately unless another force is applied, ie if you throw it downwards gravity would be a factor, the same factor that slows a car, as well as wind resistance etc.
tabetha
The instant you either lift foot off gas or dip clutch, you start to deccelerate, might be a slight amount but it cannot be any other way, otherwise you could merely accelrate to speed dip the clutch and keep going at 60 mph for hundreds of miles, you could in space as there is little gravity and no atmosphere.
Basic theory, "for every action there is an equal and opposite reaction".
A car has NO potential energy only energy which you provide with the engine by burning fuel.
Any ball thrown in the air will start to deccelerate immediately unless another force is applied, ie if you throw it downwards gravity would be a factor, the same factor that slows a car, as well as wind resistance etc.
tabetha
#57
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Originally Posted by The Rapid 1
Just scanned thru not reading properly
But did anyone mention the ground you on
ie if you was travelling down hill you could keep accellerating but if you was going uphill you would start decellerating, if on a level ground then you would be slowing, slowly but slowing wether foot on or off clutch, with foot on you would be naturaly decellerating, with foot off you would actually be braking.
my view anyway lol
Steve
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But did anyone mention the ground you on
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
ie if you was travelling down hill you could keep accellerating but if you was going uphill you would start decellerating, if on a level ground then you would be slowing, slowly but slowing wether foot on or off clutch, with foot on you would be naturaly decellerating, with foot off you would actually be braking.
my view anyway lol
Steve
take that chip
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#58
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You only need to look at some vehicle data logging to see loss of speed, although small, during a gear shift. The faster the shift the less speed that is lost. ie less time spent with torque disconnected between engine and wheels.
That's also one of the reasons why competition cars use dog-boxes and sequential boxes to reduce the shift time.
I'll try and dig out some of my motec data logging if I remember which clearly shows it happening.
That's also one of the reasons why competition cars use dog-boxes and sequential boxes to reduce the shift time.
I'll try and dig out some of my motec data logging if I remember which clearly shows it happening.
#60
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i'll hold my hands up to being a bit slow on the uptake for this sort of stuff, but, once it's all been explained it makes perfect sense
i'm more concerend that several of you seem to be providing confliciting arguments for one or the other of the answers given
and then there is the tennis ball theory and the 100 mph theory, none of which were actually relevant to the question i was asking, but intresting enough anyway
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
i'm more concerend that several of you seem to be providing confliciting arguments for one or the other of the answers given
and then there is the tennis ball theory and the 100 mph theory, none of which were actually relevant to the question i was asking, but intresting enough anyway
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#61
Happily retired
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Originally Posted by rsnissan
some people should have paid more attention at school ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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Although Chips teacher response is rather aggressive
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#64
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Originally Posted by Turby2
You only need to look at some vehicle data logging to see loss of speed, although small, during a gear shift. The faster the shift the less speed that is lost. ie less time spent with torque disconnected between engine and wheels.
That's also one of the reasons why competition cars use dog-boxes and sequential boxes to reduce the shift time.
I'll try and dig out some of my motec data logging if I remember which clearly shows it happening.
That's also one of the reasons why competition cars use dog-boxes and sequential boxes to reduce the shift time.
I'll try and dig out some of my motec data logging if I remember which clearly shows it happening.
![Top](https://passionford.com/forum/images/smilies/smile011.gif)
#65
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so sorry i was arguing the accelertion was still continuing after the clutch was dipped... i was a twat (and very drunk for that matter!) f=ma and all that...
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#67
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Originally Posted by AlexF
Originally Posted by The Rapid 1
Just scanned thru not reading properly
But did anyone mention the ground you on
ie if you was travelling down hill you could keep accellerating but if you was going uphill you would start decellerating, if on a level ground then you would be slowing, slowly but slowing wether foot on or off clutch, with foot on you would be naturaly decellerating, with foot off you would actually be braking.
my view anyway lol
Steve
![Red Faced](https://passionford.com/forum/images/smilies/icon_redface.gif)
But did anyone mention the ground you on
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
ie if you was travelling down hill you could keep accellerating but if you was going uphill you would start decellerating, if on a level ground then you would be slowing, slowly but slowing wether foot on or off clutch, with foot on you would be naturaly decellerating, with foot off you would actually be braking.
my view anyway lol
Steve
take that chip
![007](https://passionford.com/forum/images/smilies/bond.gif)
Take what?
Of course if your car has just dropped off a cliff or is on a massive decent its going to accelerate unless its at terminal velocity, but what the fuck has that got to do with the question or my answers?
Likewise if you happen to be doing 30 when you let off the clutch to change into second and at exactly that moment you get hit by an artic doing 50mph your car will accelerate, thats totally irrelevant too though of course.
#69
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Interesting idea and i have absolutely no idea. But basically it comes down to would a graph of acceleration vs time come back to the zero point over a split second, therefore still experiencing acceleration although less than the original, or would the drop from a certain acceleration to zero acceleration be instantaneous the moment the forward force is removed.
I think a graph from NASA show's quite clearly what would happen when the forward thrust is removed!
http://history.nasa.gov/ap08fj/pics/tli-g.gif
Interesting discussion though, get's you thinking![Big Grin](https://passionford.com/forum/images/smilies/icon_biggrin.gif)
but chip was right
I think a graph from NASA show's quite clearly what would happen when the forward thrust is removed!
http://history.nasa.gov/ap08fj/pics/tli-g.gif
Interesting discussion though, get's you thinking
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but chip was right
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#70
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Here's a printout of one of my 0-60runs done at York raceway.
To me it looks like acceleration tails off very rapidly then holds speed before I hit the next gear. I assume it just doesn't have enough time to noticeably decelerate in the 1/4s or so this takes to happen.
To me it looks like acceleration tails off very rapidly then holds speed before I hit the next gear. I assume it just doesn't have enough time to noticeably decelerate in the 1/4s or so this takes to happen.
![](https://img.photobucket.com/albums/v71/FastGuy/60in3_7.jpg)
#71
Testing the future
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don't let datalogs like that above confuse you - it is not possible to increase speed in between gearchanges (unless free falling down a fucking steep hill). it's just because the datalogger is too slow that it looks like it is
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