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#101
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On Thu, 06 Aug 2020 13:08:30 GMT, JNugent
wrote: On 05/08/2020 22:00, Kerr-Mudd,John wrote: On Wed, 05 Aug 2020 19:21:09 GMT, JNugent wrote: On 05/08/2020 20:07, TMS320 wrote: On 05/08/2020 15:14, JNugent wrote: On 05/08/2020 08:45, TMS320 wrote: On 05/08/2020 01:35, JNugent wrote: On 04/08/2020 13:47, TMS320 wrote: On 04/08/2020 12:39, JNugent wrote: On 04/08/2020 08:14, TMS320 wrote: On 03/08/2020 23:51, JNugent wrote: [] A lwer or lowered centre of gravity improves stability. I agree, Thank you. TMS320 doesn't agree, though. I much prefer carrying loads in panniers; Yes, I can see the advantages in that. apart from that a sweaty back is uncomfortable, IME, but each to their own. Seems little point in arguing over it. I didn't expect anyone to dispute that a raised centre of gravity increases instability / decreases stability. But there's always one. Let's get try discussing momentum. Extra mass = extra momentum? That computes. Heavy cars = more danger. -- Bah, and indeed, Humbug. |
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#102
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Exeter road rage driver banned for mowing down cyclist in Tescocar park
On 06/08/2020 18:58, Kerr-Mudd,John wrote:
On Thu, 06 Aug 2020 13:08:30 GMT, JNugent wrote: On 05/08/2020 22:00, Kerr-Mudd,John wrote: On Wed, 05 Aug 2020 19:21:09 GMT, JNugent wrote: On 05/08/2020 20:07, TMS320 wrote: On 05/08/2020 15:14, JNugent wrote: On 05/08/2020 08:45, TMS320 wrote: On 05/08/2020 01:35, JNugent wrote: On 04/08/2020 13:47, TMS320 wrote: On 04/08/2020 12:39, JNugent wrote: On 04/08/2020 08:14, TMS320 wrote: On 03/08/2020 23:51, JNugent wrote: [] A lwer or lowered centre of gravity improves stability. I agree, Thank you. TMS320 doesn't agree, though. I much prefer carrying loads in panniers; Yes, I can see the advantages in that. apart from that a sweaty back is uncomfortable, IME, but each to their own. Seems little point in arguing over it. I didn't expect anyone to dispute that a raised centre of gravity increases instability / decreases stability. But there's always one. Let's get try discussing momentum. Extra mass = extra momentum? That computes. Heavy cars = more danger. Heavier, bigger, faster anything = more momentum, if that's what you mean. If you alternatively mean that no-one should travel in any mode that makes their mass more than that of their body, and at any speed greater than they can walk, I don't agree with your thesis. It would rule out bicycles just as much as HumVees or 44-tonne artics. All modes are safe for practical purposes as long as they are operated within the rules and so, predictably. |
#103
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Exeter road rage driver banned for mowing down cyclist in Tescocar park
On Wednesday, August 5, 2020 at 10:01:36 PM UTC+1, Pamela wrote:
In other words, a shifting rucksack packed with groceries will destabilise a cyclist. If it is more than he can compensate for then he will fall off. Q.E.D. I have never fallen off due to a heavy backpack, only after getting hit by a car undertaking another car at a pelican crossing. |
#104
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On 06/08/2020 14:11, JNugent wrote:
What made you change your mind and start accepting the basic rules of physics as taught to us in the first year at grammar school? So by the second year you thought you knew everything and had developed your ambition to be a technician. |
#105
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On 14:11 6 Aug 2020, JNugent said:
On 05/08/2020 23:08, TMS320 wrote: On 05/08/2020 22:01, Pamela wrote: On 20:07Â* 5 Aug 2020, TMS320 said: On 05/08/2020 15:14, JNugent wrote: On 05/08/2020 08:45, TMS320 wrote: On 05/08/2020 01:35, JNugent wrote: On 04/08/2020 13:47, TMS320 wrote: On 04/08/2020 12:39, JNugent wrote: On 04/08/2020 08:14, TMS320 wrote: On 03/08/2020 23:51, JNugent wrote: If the effective centre of gravity of a bicycle and its rider is raised, eg, by placing a heavy load high up, perhaps by the wearing of a loaded backpack, what effect does that have on its stability? Does it: (a) decrease stability, or (b) increase stability, or (c) have no effect on stability? You're doing is the equivalent of saying that the sun rises over one horizon and sets over another. When asked why? you then ask "are you claiming it doesn't do this?" when the answer you should be giving has something to do with orbit and rotation. You claim a). Now show your working. There we have it. Where? There is no working. You are insisting (with as much force as you dare for fear of rightful ridicule) that raising a cyclist's centre of gravity will not decrease that person's stability. Thank you for being as clear as you feel able. It'll do. Your meaning is plain enough. Oh, it's certainly clear enough that you don't have a clue. You are insisting that raising the centre of gravity does not affect stability. Thanks for making your (erroneous) position clear. I recall that on a legal forum you once related how you started your working career failing to be an electrical technician. You should know there is more to science than stripping wires. Thank you for making the desperation of your position - insisting that a raised centre of gravity will not affect the balance of a bicycle - even clearer. (That confirms I'm not thinking of the wrong person.) Your position was that raised CoG decreases stability. Now it "affects stability". It's an inverted pendulum problem. An inverted pendulum is inherently unstable and the thing that keeps it upright is a servo mechanism. Turn the servo mechanism off and it will fall over. CoG and moment of inertia are just parameters that have to be accounted for the servo. Thus when masses are added or relocated on a bike or on the person riding it, it might take a moment to recalibrate but the fundamentals don't change. A human can do the calibration once and remember it for next time. A nice example is a space rocket. This is balanced on one point, not two as a bike (try standing on one leg with your eyes closed). When a rocket takes off, the fuel load reduces so the GoG and MoI are constantly changing accordingly. It's not a question that the rocket becomes more or less stable, it's all down to whether the servo mechanism is good enough to keep it pointing up. In other words, a shifting rucksack packed with groceries will destabilise a cyclist.Â* If it is more than he can compensate for then he will fall off.Â* Q.E.D. It would. By George... Just as it would for someone walking or running. People also fall over when they can't compensate for a slippery surface or a step. But if you're carrying a bag on your back, make sure the straps are done up properly. What made you change your mind and start accepting the basic rules of physics as taught to us in the first year at grammar school? I imagine TMS320 slipped out his two word acceptance of the facts in the hope that it wasn't picked out of his comment about pedestrians. |
#106
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On 20:13 6 Aug 2020, Simon Mason said:
On Wednesday, August 5, 2020 at 10:01:36 PM UTC+1, Pamela wrote: In other words, a shifting rucksack packed with groceries will destabilise a cyclist. If it is more than he can compensate for then he will fall off. Q.E.D. I have never fallen off due to a heavy backpack, only after getting hit by a car undertaking another car at a pelican crossing. By your own admission in your book you have "Scorpio powers" but not everyone else can be as perfect as you on every single journey they make. Maybe it follows that these lesser cyclists shouldn't be allowed to cycle on the road with a rucksack. |
#107
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Exeter road rage driver banned for mowing down cyclist in Tescocar park
On Friday, August 7, 2020 at 1:26:32 PM UTC+1, Pamela wrote:
Maybe it follows that these lesser cyclists shouldn't be allowed to cycle on the road with a rucksack. How would you police a ban on rucksacks? |
#108
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On 06/08/2020 20:18, TMS320 wrote:
On 06/08/2020 14:11, JNugent wrote: What made you change your mind and start accepting the basic rules of physics as taught to us in the first year at grammar school? So by the second year you thought you knew everything and had developed your ambition to be a technician. That is a very poor wriggle. So.... What made you change your mind and start accepting the basic rules of physics as taught to us in the first year at grammar school (or, as is more likely to be the case for you, at a "bog-standard" sink comp)? |
#109
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Exeter road rage driver banned for mowing down cyclist in Tesco car park
On 14:11 7 Aug 2020, Simon Mason said:
On Friday, August 7, 2020 at 1:26:32 PM UTC+1, Pamela wrote: Maybe it follows that these lesser cyclists shouldn't be allowed to cycle on the road with a rucksack. How would you police a ban on rucksacks? If hypothetically rucksacks were banned then it would be easier to spot a cyclist with a rucksack than a driver using a mobile phone. |
#110
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Exeter road rage driver banned for mowing down cyclist in Tescocar park
On Friday, August 7, 2020 at 6:26:45 PM UTC+1, Pamela wrote:
If hypothetically rucksacks were banned then it would be easier to spot a cyclist with a rucksack than a driver using a mobile phone. If only it was made as illegal as killing two people, eh? QUOTE: An HGV driver who killed a boy, 14, and a teaching assistant, 50, after ploughing into a minibus while checking Facebook has been jailed for almost nine years. James Majury, 33, was travelling 56mph along the M58 motorway in Lancashire on January 8, 2019, when his Mercedes Arocs, carrying scaffolding, ploughed into the back of a nine-seater minibus. Majury had been texting, playing the mobile game Hustle Castle, viewing Sky Sports News and checking Facebook before he hit the stationary Vauxhall Vivaro minibus carrying pupils and staff from Pontville School, a special educational needs facility in Ormskirk. The HGV driver only noticed how close the minibus was in front of his 19 ton lorry half a second before impact when he slammed on his brakes, Preston Crown Court heard. https://www.dailymail.co.uk/news/art...ine-years.html |
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