Surely, there is no (ordinary) retail car on the planet which can accelerate as fast as it decelerates?
Without ABS braking, it is quite easy to "skid" while applying a harsh brake because you overcome the limit of force between the tires and the road. Similarly, it is quite easy to "burnout" as well with a strong engine for the same reason.
So although the strength of the two systems is not the same, the limiting factor for both of them is identical. Hence, symmetry.
He claims in his model, 'his car decelerated at - 10 m/s^2 and, instantaneously, accelerated to + 10 m/s^2 at t = 0'.
No known mechanical system is capable of achieving such an instantaneous jump without a tail-off period. ...."
http://www.jmag-international.com/catalog/img/e68-3b.gif
The brakes are independent, so it's not as if one system has to provide both accelerations, one just needs exceptional timing of the feet. A lot of rally car drivers can do similar maneuvers
This is the same reason why the Tesla Roadster has such a killer 0-40mph
To do 1g in acceleration you would need to do 0-60 in 2.75s that MIGHT be possible for a $1M supercar (or a bike ;-)
http://m.youtube.com/watch?v=6v4YNkurhLk
The only point on that plot which would be even more of an outlier would be a shifter-kart.
Just goes to show, if you haven't got a hope in hell, try bullshit and long words.
[edit] Just looked up formula one cars, they are 2g acceleration and 5g braking apparently.
1. When an officer asks how fast you were going, never say anything over the speed limit or that's automatic guilt. Just decline to know or tell. A lot of people say within a +5-10mph range over the speed limit because they think that is "ok", but in fact anything over the speed limit is speeding and is ticket worthy.
2. Look up laws in your area about loopholes. I once had a friend who got pulled over for doing a burn out in his Cobra, the officer was so aggravated he forgot to wear his hat when he got out of his car and the case got dismissed because of it.
3. Always be polite. Always, always, always. Even if they're real jerks, which has never happened to me, always be courteous and make things go as smoothly as possible. If you start being an ass they WILL remember it and will take that into consideration when writing the ticket and/or in front of the judge. You'll have a chance to give your side in court, so don't bother wasting your breath with the officer.
4. I once got out of a reckless driving ticket ($400+, I was young and dumb) because I just happened to know the director of the area highway patrol. It turned out I was in the top 5 worst tickets the highway patrolman had ever given out in his 20+ years of duty. My director friend told him I was a good kid and my parents were going to kill me anyway, so he let me off.
5. And really, the single most best way to not get a ticket, don't break the rules. Of course in this guys case the officer apparently was mistaken, but more times than not that's not the case.
This got large quickly. Just some things I've learned over a few years of driving.
i.e. pull over in a place which is safe for both vehicles and for the officer on foot, keep hands visible all the time, turn on dome light, put keys on dashboard, and be polite. Also I tend to announce any moves, like "my wallet is in my back pocket, reaching for it with my left hand", which is overly cautious, but subtly communicates to the officer that you are familiar with police procedures and concerns. You can usually see him visibly relax, at which point it's likely the interaction will be more pleasant. Don't volunteer more information than necessary, but answer questions politely and clearly. (usually, it's just "license and registration." and then "do you know why I stopped you" "no officer"...)
I've gotten >120mph written at 80mph in a 70mph by doing this, several times (I-5 + V8 + empty road...), which can be traffic-schooled. I don't care about a $150 ticket, I care about potentially getting the car impounded for reckless driving, or a vehicle search, or points.
If I were a officer and someone narrated what they're doing like that I'd immediately find it suspicious. Just say you're gonna get your wallet, cops aren't all completely stupid.
"I'm reaching for my wallet with my left hand sir" sounds retarded.
- Use the most official title: 'Yes Trooper', 'Thank you sheriff', etc.
- Be honest, authentic and remorseful, but not apologetic. (I don't agree with #1)
- Be well groomed. After I got my beard and hair cut, I stopped getting tickets. I've gotten 8 consecutive warnings, most verbal. Before getting 'cleaned up', I got 9 tickets and 1 warning.
- Have a woman in the car. Doesn't have to say anything, just smile and reply to questions.
- Pull over, turn on the dome light and leave your hands on the steering wheel. I lower my window when a flashlight hits me, and only get paper work in response to a command.
My streak of warnings still dumbfounds me. I even got pulled over twice after a superbowl for a tail light and got a verbal warning twice.
That really sounds like an urban myth.
This actually varies per jurisdiction, though that's still a good general rule. In Florida, for example, you can't be ticketed for 1-4mph over the limit thanks to a law that was passed to eliminate speed traps.
It helps that I'm really tall, but it's worth it for the look on their face when it turns from 'bored paternalism' to 'we might have to watch what's going on here'; it takes some of the initiative from them. It's a subtle way to change the power dynamic, especially if you're tall - you can no longer be talked down to, plus you're free to move. Being free to move isn't about posing a physical threat, but being able to control your end of the conversation better, plus you can watch what they're doing. Of course you should always, always remain polite, but screw being in the entirely submissive position of being locked into your seat.
Incidentally, the 'random' checks have stopped in the past 5 years that I've had a newer car... and curiously my mother has never been 'randomly' stopped.
Particularly if you're physically imposing you run the risk of a panicked officer pulling their weapon..
This seems more likely.
I beat a speeding ticket with GPS data once - except the judge didn't even ask to see the data. I just said I had it. (Yes, the officer was there in court too.) The judge said he'd take my word for it.
April fools perhaps?
"The officer had special two-week training that qualifies him to estimate angular velocity whichever the fucking way he wants, even with a completely obstructed view."
Courtesy of Canadian reality. Plot me a graph to counter that.
I was wondering how can he misjudge the speed so far apart. This article explained the phonomena.
Result: "Too bad. Pay me."
Like they say in the movies; with law it's what is the truth, and what you can prove. He failed the latter and got a hefty fine.
Good economics reasoning too - losing a loss is as good as gaining a gain.
Physicist: "Pretty much cold feet and sneezes your honor, QED."
Judge: "Well seeing as how you're a member of the affluent class I shall not inconvenience you further."
