Sorry, but even I'm convinced now that this is wrong.
(I did actually try it too the other night just to totally convince myself)
Welcome to the site though.
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- Thread starter m.r.davies
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(I did actually try it too the other night just to totally convince myself)
Welcome to the site though.
Thanks for the welcome.
In reality the sustained acceleration probably won't be noticeable in the car, it won't last very long at all that's for sure but the rate of acceleration will fall until it becomes decelaration, probably only takes a fraction of a second but it won't just become deceleration straight away. Of course a decrease in the rate of acceleration will feel like deceleration in the car. I think you would need some pretty sophisticated measuring equipment to show this.
The truth is you will never be able to tell by looking at the guages in the car, or just by how it feels. Its just physics, the rate of acceleration will decrease as soon as the accelerating force is removed but as the rate of acceleration of the car is quite significant it will take some time to disappear, not very much time granted, but some time nevertheless.
I don't really get the obsession with 0-60 times, what's far more important is the performance in the 40-100 range, its where you really notice performance in real life, for overtaking etc. I have never been keen on giving any car a hard time in 1st gear, it all seems rather stressfull on the car but its just my opinion.
I have to say that the lcr is quite an impressive car, wish I had realised this a long time ago!
Matthew.
In reality the sustained acceleration probably won't be noticeable in the car, it won't last very long at all that's for sure but the rate of acceleration will fall until it becomes decelaration, probably only takes a fraction of a second but it won't just become deceleration straight away. Of course a decrease in the rate of acceleration will feel like deceleration in the car. I think you would need some pretty sophisticated measuring equipment to show this.
The truth is you will never be able to tell by looking at the guages in the car, or just by how it feels. Its just physics, the rate of acceleration will decrease as soon as the accelerating force is removed but as the rate of acceleration of the car is quite significant it will take some time to disappear, not very much time granted, but some time nevertheless.
I don't really get the obsession with 0-60 times, what's far more important is the performance in the 40-100 range, its where you really notice performance in real life, for overtaking etc. I have never been keen on giving any car a hard time in 1st gear, it all seems rather stressfull on the car but its just my opinion.
I have to say that the lcr is quite an impressive car, wish I had realised this a long time ago!
Matthew.
Give this man a gold star!!Try in first acceleration down a steep hill, push in the clutch and watch the speedo. The actual mph reading might be inaccurate but if it is going up then this is only due to there being a certain amount of acceleration persent. This will be from the incline but as the man said there is more than just the throttle position acting on the car, there is also a large amount of momentum from the 1,350 Kg's of car. Zero throttle doesn't mean zero acceleration
Damm it now I'm involved, hope it doesn't go another 7 pages of rants and handbag fights
Another one that doesn't agree with Newton's Second Law of Motion. Utter rubbish!
Momentum is a potential force, this is only realised then the engine is not supplying more force than this force.
Try this.. put car in first rolling down a hill with no acceleration. The car will try and accelerate but the gear box will gear this acceleration down.
If the car can only accelerate when the throttle is depressed how can this happen??
on the flat, since when do you test accelaration going down a hill?
if you read my post you will see the word force - think you will find gravity is a force - hence a the car will accelarate with a force acting on it!
if you read my post you will see the word force - think you will find gravity is a force - hence a the car will accelarate with a force acting on it!
Hello,
I don't think that a car sitting on a flat road will accelerate without a force being applied to it and I never have done.
If you take your foot off the accelerator in a car it will slow down, we all know this, and its not what I am saying.
When you remove the power accelerating the car it will not maintain or increase its current rate of acceleration, but it will continue to accelearte at a constantly diminishing rate unti it very quickly becomes deceleration.
This is all in accordance with Newtons Laws of Motion. It takes time to transition from a positive rate of acceleration to a negative rate of acceleration (slowing down), in a car that doesn't take long but it will take some time and it will be measurable with the right equipment.
As I haven't measured it I am not saying that if you get to 58mph in second gear, depress the clutch and the car will accelerate magically to 60mph on its own. What will happen is the car will hit maybe 58.005 mph before it starts to slow down, it will be a very small amount I am sure.
Matthew.
I don't think that a car sitting on a flat road will accelerate without a force being applied to it and I never have done.
If you take your foot off the accelerator in a car it will slow down, we all know this, and its not what I am saying.
When you remove the power accelerating the car it will not maintain or increase its current rate of acceleration, but it will continue to accelearte at a constantly diminishing rate unti it very quickly becomes deceleration.
This is all in accordance with Newtons Laws of Motion. It takes time to transition from a positive rate of acceleration to a negative rate of acceleration (slowing down), in a car that doesn't take long but it will take some time and it will be measurable with the right equipment.
As I haven't measured it I am not saying that if you get to 58mph in second gear, depress the clutch and the car will accelerate magically to 60mph on its own. What will happen is the car will hit maybe 58.005 mph before it starts to slow down, it will be a very small amount I am sure.
Matthew.
Rubbish.
Force = Mass x Acceleration.
The moment Force becomes zero, either Mass or Acceleration become zero. Guess what, it isn't mass.
You have a distorted view of what acceleration is. Its the rate of change of speed over time. Once there is no force, there is no change.
(Deceleration only happens because of resistance).
Rubbish.
Force = Mass x Acceleration.
The moment Force becomes zero, either Mass or Acceleration become zero. Guess what, it isn't mass.
You have a distorted view of what acceleration is. Its the rate of change of speed over time. Once there is no force, there is no change.
(Deceleration only happens because of resistance).
When does the force become zero?
I totally agree with you, I just think it takes a very small amount of time for an object with as much momentum as a car to change from a positve rate of acceleration to a negative one, there are many forces in action and the force from the engine providing the positive acceleration doesn't disappear the instant the clutch is depressed and it takes a very very small amount of time for the aerodynamic forces, friction etc to reduce the positve rate of acceleration to zero before they start generating a negative rate of acceleration.
If my car is accelerating at 10m/s/s and it decelerates at 5m/s/s with no power applied then there is a change in the rate of acceleration of 15m/s/s when I remove the power, it takes a very small amount of time for that to happen and for a brief moment the car is still accelerating, but again it is for a very very brief moment only.
Matthew.
If my car is accelerating at 10m/s/s and it decelerates at 5m/s/s with no power applied then there is a change in the rate of acceleration of 15m/s/s when I remove the power, it takes a very small amount of time for that to happen and for a brief moment the car is still accelerating, but again it is for a very very brief moment only.
Matthew.
Now would be a good time to close this post before it get out of hand and we start calculating the square root of a tin of beans
Hope we all have a happy day and some nice friendly discussions about our nice fast cars that we are getting to know better and like more everyday
Well done Matty!
I couldn't be arsed explaining this.
Not rocket science is it? not sure why people didn't get it, pretty basic stuff.
In our car's case, the moment that the clutch takes the drive off the transmission.
Well, I'm just happy that I expressed my view. Whatever happens its all pretty irrelevant to how good the car is, I just wish I had realised what a nice car they were before now!
i have to say, i cant help but agree with matt here, its basically what i was trying to say earlier on in the thread. acceleration is linear, it cannot go from 10m/s/s to 0m/s/s without passing through 9, 8, 7, 6, etc.
there WILL be a short unnoticeable slow down in acceleration before deceleration occurs.
there WILL be a short unnoticeable slow down in acceleration before deceleration occurs.
No, you don't understand this!
Acceleration can change from 10m/s/s instantaneously to 0m/s/s if the force is removed instantaneously.
Acceleration is the rate of change of velocity. If velocity suddenly stops increasing, acceleration ceases.
Please come back with a proven arguement rather than unproven theories.
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