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Re: Why ESP Ponycars Weigh So Much (more than M3s)B

 To: Randy Chase Re: Why ESP Ponycars Weigh So Much (more than M3s)B Curt and Kim Bennett - Houston Region Fri, 26 May 2000 22:56:13 -0500
 ```I just verified this on my car scales. Equally raising both corners increases the weight on the end that was raised. No surprise, Byron was right. -Curt Randy Chase wrote: > *warning....possible detailed techno-geek stuff follows* > > Iain Mannix wrote: > > > Raising/lowering/front/rear. > > > > Byron Short once used a big hammer to convince me that raising one end > > of a car would make that end heavier. It is true. > > In what way did his hammer convince you? 8-) > > You can do it with > > two bathroom scales and a sawhorse(or anything that is relatively > > heavy that will not allow the mass to shift). Put two legs of the > > sawhorse on one scale, call it the front. Put two legs of the > > sawhorse on the other scale, call it the rear. Sit two > > bricks/dictionarys/heavy things on the sawhorses over the legs. > > Observe "front and rear" weight. > > > > Take the brick off the top of the sawhorse on the "front" scale, put > > the brick *under* the legs of the sawhorse, raising the "front" three > > inches(or however tall the brick is). > > > > There are still the same things on the scales - one sawhorse, two > > bricks - but the weight will change; not total weight, but > > distribution. It really works. > > Ian, I respectfully suggest that this is an incorrect method of > demonstration. In one case, the scale is measuring roughly have the > weight of the sawhorse, and part of the weight of the bricks, because > the bricks load is shared by the sawhorse, and therefor distributed to > both scales. When you put the bricks under the sawhorse, the main change > comes from the one scale weighing 100% of the bricks, instead of have > the load shared. > > I also disagree with the basic point, but I am willing to be shown in > what way I am wrong. It has always been my grasp, that in order to do > less work while appearing you are carrying the same load (hehe) when > carrying sofas or other heavy furniture, you should raise your end. The > higher end weighs less. > > This seems simple when viewed simply. If one takes a long heavy object > and tilts it, eventually the higher end has almost no weight, and all > the wieght is on the lower end. Now a car is a little more different, in > that you didn't raise the entire car, you just changed it's location of > mass and center of gravity. The tires still rest on the ground. There is > also further complication because the higher end, though exhibiting > slightly less force downward, will be affecting by suspension changes > and the higher center of gravity. > > In any case, I was pretty sure that raising one end of a bar lightens > it's load on that end. I did a quick test on a scale that confirms this. > The higher end of the bar weighed less when I raised it. > > If I am missing something, please let me know what it is. I am not > trying to debate the point, just understand why something I have thought > for many years may be incorrect. > > Respectfully, > > Randy Chase ```
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