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Physics Question - ma = mg

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JohnnyMalaria:

--- Quote from: bostonman on July 09, 2021, 02:35:42 pm ---
--- Quote ---herefore, lifting a 50 kg dumbbell by 1 m is 490 J, or only 0.117 kcal.
--- End quote ---

Just tell me if I'm going over the deep end or just reverting to "calories" being incorrectly used. So if I eat a Snicker's Bar at whatever.... 100 calories, does this theoretically mean I have to lift that dumbbell 855 times (100 divided by 0.117) to burn off the snack?

Or are calories on nutrition labels using the wrong units?

--- End quote ---

Seems about right. An innocent Snickers (or half a pint of chocolate milk, some fruit etc) can ruin the benefits of your short trip to the gym.

This shows a table of typical calorie expenditures for various types of exercise. Damn those high energy density peanuts!

https://www.brianmac.co.uk/energyexp.htm

bostonman:

--- Quote ---Bostonman is on his way to understanding the complexity.  Most aren't interested or don't have the capacity.
--- End quote ---

I appreciate the compliment. I find that many don't care to dive into understanding many items we use in life or general concepts.

With me, sometimes I try digging too deep for no reason.

Often times I have an appreciation for when the math matches real life situations. Obviously anomalies get thrown in the loop, however, being an "engineer", tossing in approximations can help avoid a lengthily and unnecessary list of calculations.

As for kilo-calories, a slight reason exists why I somewhat switched to this area. The first is because were discussing Work. The other reason is due to going to the gym. It would be nice to have an idea that if I pickup something and place it down, that it will equal (on a theoretical level) X minutes on the treadmill.

I'd like to think that if I lift weights for an hour and someone brags they walked an hour on the treadmill, that I can scientifically state that taking a Neanderthal approach burned an equal (or more) amount of calories.

RJSV:
Yes, BostonMan, your direct work has potential (no pun) health benefits. BUT, don't ignore the warm-up stuff; doing light stretches, and movements. Postures such as standing on one leg, alternating, that's great as (we) age.
Heck, sincerely, look at some YOGA or TaiChi practice, ,(maybe can skip some of the strength work).
The simple stretches eliminate some resistance in body movement.
   In older days, folks didn't look to burn calories, except maybe their horses'.

bostonman:
As for this thread, and my questions deviating towards burning calories, this would be totally different.

I'm still focused on the math/physics of being able to argue differences when someone brags they did an hour on the treadmill and feel they burned more calories than someone lifting weights.

JohnnyMalaria:

--- Quote from: bostonman on July 26, 2021, 02:56:20 am ---As for this thread, and my questions deviating towards burning calories, this would be totally different.

I'm still focused on the math/physics of being able to argue differences when someone brags they did an hour on the treadmill and feel they burned more calories than someone lifting weights.

--- End quote ---

Simple answer for such folk: I'm not here just to burn calories.

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