Why on Earth do people still use US units? OK if your final result must be expressed that way, but do the math in metric then convert at the end.
Using US units is like doing long division in Roman numerals. It can be done but is way-hard so is it far easier to convert to Arabic number do the division that converts back to Roman. In Rome a simple problem like MCXXVI / VII requited the equivalent of graduate-level education. But today with our better number system, we teach 10-year-olds to do this with paper and pencil. The US system is like using Roman numbers. It is so hard that most people get wrong answers. The proof is in this thread. So far EVERY calculation is wrong One huge mistake I saw is confusing mass and force. there is no such thing as a 200-pound mass. The US unit of mass is the "slug" Your calculations are off by a factor of about 32 if you try and use pound as mass units. Doing Physics using US customary units is so horrible that they have not taught this in schools for the last 40 years. No one but old folks would even know this stuff. I remember my Physics professor at UCLA in the late 1970s saying "just don't bother with feet, slugs and BTUs and miles" In high school, we did have to do a few of the problems using feet per second and slugs of mass. I think I was of the generation who saw the switch. We had to use slide rules in 10th grade but in 11th the decision was made to use calculators and very soon after that all science education was metric only. I taught high school science for a while and never once would ever talk about US units like feet or pints or pounds. The students had no problems with this as their middle school teachers did the same. No one who is educated in the last few decades would know how to work with "feet per second squared" Here is a great explanation of US units for mass and force, after reading it you will see why no one should ever bother with this https://en.wikipedia.org/wiki/Slug_(unit) <https://en.wikipedia.org/wiki/Slug_(unit)> I think the advice I got at UCLA was the best "don't even bother learning this" On Wed, Jul 22, 2020 at 9:22 PM Bari <[email protected]> wrote: > > On 7/22/20 11:04 PM, Bruce Layne wrote: > > > > On 7/22/20 11:43 PM, Thaddeus Waldner wrote: > >> 1g = roughly 32in/s^2 > > 1 g is 32 ft/sec^2 > > > > Feet, not inches. > > > > Comparing Standard Gravity to Other Acceleration Units > > Standard Gravity 1 G's > Meters per Second per Second 9.81 > Feet per Second per Second 32.174 > Inches per Second per Second 386.09 > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
