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mprm86
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Which is the maximum acceleration that a body (like a person or a car) can reach in the ground, and without using any extern help?
mprm86 said:Sorry, the question wasnt clear at all. I will be more specific: Is there a limit of the acceleration a car can reach using only its engine (that is, in a flat track for example)? My answer would be yes, the maximum acceleration that a car can reach in such conditions is g (gravitational acceleration) because the only force acting on it is the one due to the friction with the ground, and the latter depends on the normal force and the friction coefficient, but i´m not quite sure I am right.
Thanks.
mprm86 said:Sorry, the question wasnt clear at all. I will be more specific: Is there a limit of the acceleration a car can reach using only its engine (that is, in a flat track for example)?
Thanks.
You perplex me, Stingray. I thought that you were a professional racer. Don't try to tell me that a digger running 4 second quarters is accelerating at 1g max. My Roadrunner was a bloody joke on the street racing scene, and I pulled at least .7g going into 2nd gear. Off the line was probably less, but it was at least .5g, as can be attested to by my friend who got sacked by a can of juice that was on the dashboard when I lit up.Stingray said:Yeah, it's roughly g unless you hit something . It can be a lot more with special tires or aerodynamic help.
Danger said:You perplex me, Stingray. I thought that you were a professional racer. Don't try to tell me that a digger running 4 second quarters is accelerating at 1g max. My Roadrunner was a bloody joke on the street racing scene, and I pulled at least .7g going into 2nd gear. Off the line was probably less, but it was at least .5g, as can be attested to by my friend who got sacked by a can of juice that was on the dashboard when I lit up.
Without aerodynamic aid your downforce is limited to 1g, but not your acceleration. That's purely a function of horsepower and traction. And as pervect pointed out, that only applies if you're relying upon engine-driven wheels as your motive influence. I've seen a car with a J-34 turbojet run the quarter in slightly less than 3 seconds from a dead-start. Try to tell me that it pulled less than 1.1g.
As long as they don't offer to pay you to not do it, you're okay.Stingray said:No, I'm not a professional racer. It's just a hobby. I don't have anywhere near the skill to be paid for it.
A reasonable assumption.Stingray said:Of course a jet or rocket-powered car can accelerate much faster than 1 g. I interpreted the original question to mean a car being accelerated only through its tires.
Ahhh... Well then, we're on the same boat. (But I still disagree about the brake thing. )Stingray said:And you're right that dragsters do run much faster than 1 g. But they have the aforementioned special tires and wings. Street legal tires max out around 1 g, and that would only be for an AWD car. You say that acceleration depends on "power and traction," and that's basically true. I'm talking about available traction.
So the verdict is: No, there is no maximum speed.mprm86 said:Sorry, the question wasnt clear at all. I will be more specific: Is there a limit of the acceleration a car can reach using only its engine (that is, in a flat track for example)? My answer would be yes, the maximum acceleration that a car can reach in such conditions is g (gravitational acceleration) because the only force acting on it is the one due to the friction with the ground, and the latter depends on the normal force and the friction coefficient, but i´m not quite sure I am right.
Thanks.
memarf1 said:You all have forgotten your first physics class ever. Although friction plays a large role in acceleration, it plays virtually no role in maximum speed with a mechanical engine. Now, I say virtually because Special Relitivity states that the maximum speed you can attain is the speed of light or c. c is the maximum b/c of the resistance and/or friction that the threading of space-time itself plays.
My favourite from a perspective of design genius, even though it's a lot slower, is Les Shockley's "Shockwave". It's a (Kenny? Peterbilt?) semi tractor with 3 J-34's. That son of a ***** weighs 3 or 4 tonnes and blows through the traps in less than 14 seconds. Given the thrust-to-horsepower equivalence at sea level and under 500 kph, he's pushing about 30,000 hp. The 'burner pops' that he lights off while staging can deafen you at 100 meters.DaveC426913 said:Holy cr*p.
mprm86 said:Sorry, the question wasnt clear at all. I will be more specific: Is there a limit of the acceleration a car can reach using only its engine (that is, in a flat track for example)? My answer would be yes, the maximum acceleration that a car can reach in such conditions is g (gravitational acceleration) because the only force acting on it is the one due to the friction with the ground, and the latter depends on the normal force and the friction coefficient, but i´m not quite sure I am right.
Thanks.
Well... that was impressive! The bloody thing did it's whole schtick in about a tenth of the time that it took to load the file.Jeff Reid said:Here's a link, click on the picture to see the video.
That one just makes me think of the little dude in Mad Magazine's 'Spy vs. Spy' cartoons.Jeff Reid said:Cool pic of a smaller rocket sled at 4800ft/sec.
memarf1 said:Pervect, I really do not know why you would accuse me of flaming or baiting flaming, however, yes there is such a thing as threading of space and time. Although you may have heard it called something else, suck as the fabric of space. This is learned much when being taught about Einstein's Gravitational Theories. You must still be in Classical physics to not understand these theories.
Third, to relate this back to the original question since you seem to have a hard time relating things of this nature back, friction on the tires, road, and even inside the engine all play a role in maximum speed and acceleration, however, with a MECHANICAL engine, mechanical being the key to this explanation, the only thing that limits max speed and acceleration are relativity. Einstein. Physics 101.
Hey, now...! Let's not discount the RV from 'Spaceballs'.Stingray said:The original question was clearly asking about a car, and nothing going anywhere near c would resemble such a thing in any way.
memarf1 said:Pervect, I really do not know why you would accuse me of flaming or baiting flaming, however, yes there is such a thing as threading of space and time. Although you may have heard it called something else, suck as the fabric of space. This is learned much when being taught about Einstein's Gravitational Theories. You must still be in Classical physics to not understand these theories.
Now, please do not flame me again.
memarf1 said:Stingray, you must not know a whole lot about relativity considering you don't even know about the fabric of space. When I refer to the threading of space I am referring to the fabric which if you know anything about relativity you cannot deny that Einstein defined the fabric of space with his Gravitational Theory. I think you are arguing for classical physics not modern physics.
Also, the original question was not OBVIOUSLY for a normal car. The question was, is there a maximum speed or acceleration or does the friction of the road or air limit this. There are limits if you us differential equations but they will be located close to c. And Icebreaker is in fact correct for the actual equation, however if you were to take the limit, it should theoretically(as I have not done the calculation) be located close to c.
Sorry dude, but your memory fails you. The original question was:memarf1 said:Also, the original question was not OBVIOUSLY for a normal car. The question was, is there a maximum speed or acceleration or does the friction of the road or air limit this.
pervect said:If one moves away from cars, there are some interesting proposals to accelerate electrons at 10^25 g (1g = 9.8 m/s^2 = 1 Earth gravity). The method could potential reach as high as 10^28 g, but no higher.
Danger said:You could never get to 0.5% of light-speed and remain on the ground, no matter what tire composition, spoilers, and drag-reduction equipment you use.
I can't help thinking that off-the-shelf suspension components might be inadequate. (Parts Man: "You want shocks that can take 200,000g? Man, I'm going to have to order that in. Call me next week.)Stingray said:Well, you could have upward-pointing rockets. Unfortunately, anyone inside the car would be reduced to goo no matter what.
memarf1 said:The original question was updated in the third response on this thread. It was not OBVIOUSLY for only cars.
mprm86 said:Sorry, the question wasnt clear at all. I will be more specific: Is there a limit of the acceleration a car can reach using only its engine (that is, in a flat track for example)? My answer would be yes, the maximum acceleration that a car can reach in such conditions is g (gravitational acceleration) because the only force acting on it is the one due to the friction with the ground, and the latter depends on the normal force and the friction coefficient, but i´m not quite sure I am right.
Pervect was right; the guy's flame-baiting. Let's just ignore him.Stingray said:The third response is where it was clarified that the question specifically referred to cars.
So once you've made this engine out of neutronium so it won't explode at several million rpm... you're going to fuel it with antimatter to get that much mass reciprocating?memarf1 said:the only limits that a MECHANICAL engine would have, would be due to relativity.
We've not only watched it; we've done it. And apparently Stingray is still doing it.memarf1 said:You should watch racing sometime.
"Max Acceleration: Body Reaches on Ground" is a term used in physics to describe the maximum rate at which an object's velocity changes as it moves along a straight line. It is also known as the maximum acceleration or the peak acceleration.
The formula for calculating "Max Acceleration: Body Reaches on Ground" is a = (vf - vi) / t, where a is the acceleration, vf is the final velocity, vi is the initial velocity, and t is the time taken for the change in velocity to occur.
The SI unit for acceleration is meters per second squared (m/s²). However, it can also be measured in other units such as feet per second squared (ft/s²) or kilometers per hour squared (km/h²).
Several factors can affect "Max Acceleration: Body Reaches on Ground", including the mass of the object, the force applied to the object, and the surface on which the object is moving. Other factors such as air resistance and friction can also have an impact on the maximum acceleration.
"Max Acceleration: Body Reaches on Ground" is important because it helps us understand how quickly an object can change its velocity and how much force is required to do so. It is also crucial in fields such as engineering and transportation, where knowledge of maximum acceleration is necessary for designing and testing vehicles and structures.