Let's say a car with 100hp. Weighs 900kg and has a torgue of 120nm. Is there a way to calculate the acceleration?
How to estimate a car's acceleration?, got formula?
How to estimate a car's acceleration?, got formula?
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Feb 18 2007, 04:54 PM, updated 18y ago
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#1
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Senior Member
926 posts Joined: Feb 2006 From: KL, Malaysia |
Let's say a car with 100hp. Weighs 900kg and has a torgue of 120nm. Is there a way to calculate the acceleration?
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Feb 18 2007, 05:13 PM
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#2
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Senior Member
3,681 posts Joined: Nov 2005 From: - |
u drive for 5 seconds...
and tell me what is the speed when a)0second b)5seconds then i can calculate...lolx a = v-u / t |
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Feb 18 2007, 05:22 PM
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#3
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Senior Member
608 posts Joined: May 2005 From: Penang Island |
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Feb 18 2007, 06:06 PM
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#4
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Senior Member
9,309 posts Joined: May 2005 From: Sabah-Australia-Shah Alam. |
Yes there is a way but I think after ignoring other factors(such as drivetrain losses, aerodynamic drag, gear ratios, assuming you have infinite traction, etc.) it's still quite complicated.
I dunno the exact formula, any Physicians here? I'm interested also. The horsepower number can be ignored. Horsepower IS torque and torque is work. Horsepower is just work at a certain time(rpm) so you see we don't really need it. |
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Feb 19 2007, 05:22 AM
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#5
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Senior Member
684 posts Joined: Jan 2003 From: MY |
Accelaration does not care about what drive train, torque or what nots.
jason18689 has already given you the formula. So, use it lar. |
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Feb 19 2007, 09:05 AM
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#6
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Senior Member
926 posts Joined: Feb 2006 From: KL, Malaysia |
ok ok. but can you explain the formula? I don't study physics..
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Feb 19 2007, 09:12 AM
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#7
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Senior Member
6,238 posts Joined: Sep 2005 From: Kuala Lumpur |
QUOTE(allornothing @ Feb 19 2007, 09:05 AM) lets say you accelerate for 5 secondsV - final velocity - at the 5th second, look at your speed meter u - initial velocity - at your beginning of acceleration t - time taken for change of velocity hence apply the formula of rate of change of velocity / acceleration (v - u) / t This post has been edited by karhoe: Feb 19 2007, 09:13 AM |
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Feb 19 2007, 10:04 AM
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#8
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Senior Member
2,281 posts Joined: Oct 2006 From: Littleroot Town |
mate,
just hit the gas. count to 5. see the speedometer. read it at count 5. divide by 5. done. haha. crude example it is. just set a countdown for example 10. start countdown as u hit the gas. read the speedo when the countdown ding dongs. divide the seen speedo by 10. edit: assumed u start from 0 tho. This post has been edited by LEVIATHAN: Feb 19 2007, 10:05 AM |
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Feb 19 2007, 11:04 AM
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#9
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Senior Member
9,309 posts Joined: May 2005 From: Sabah-Australia-Shah Alam. |
I thought he asked how to calculate the car's acceleration from the power/torque alone?
If its that simple v-u/t formula, why did you mention the torque? Sorry I was mislead. Yes there are methods to calculate the car's estimated acceleration without you having to step in the car at all, but strictly for advanced university students. This post has been edited by tunertoobe: Feb 19 2007, 11:06 AM |
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Feb 20 2007, 06:09 PM
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Junior Member
207 posts Joined: May 2005 |
wah difficult ,no other easy technic
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Feb 25 2007, 03:06 AM
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Senior Member
3,429 posts Joined: Nov 2004 From: alor star • selangor • skudai |
no technique . all enigne power band at different peak ... how to estimate .
ur enigne is not chunking out 120bhp all in its rpm range from 0 until 6000 . |
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Feb 25 2007, 11:01 AM
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Senior Member
9,309 posts Joined: May 2005 From: Sabah-Australia-Shah Alam. |
That's why it isn't easy. There is a way, but I think no exact formula. The end result, no matter how much outside factors you consider in your calculation, would still be an estimate.
You have to know the power curve, the power band, the weight, how much grip you have(unless you assume you have infinite grip), aerodynamic drag(unless you exclude that), gear ratios, transmission loss(again optional), time lost in shifting, clutch slip, bla bla bla bla bla. |
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Feb 25 2007, 11:11 AM
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All Stars
15,278 posts Joined: Jan 2003 |
want to estimate the cars acceleration without formulas? get a satellite system
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