Having Some fun with Physics

Posted it here instead of my GMing blog because I just wanted to fool around with the math even if I may be wrong.


My original Post
Using human proportions to get Arm length (based on 175cm or 5'9"). X2 length to get the diameter of the arc the arm moves to raise 20lbs overhead = 6ft arc (assuming a closed fist). 6ft x 20lbs x 1 sec.

So does ST10 = a work of 120 ft*lb per second?
is my math right in calculating 162 joules/sec?

How does one measure the work of Movement?
How does one solving for FP using work using Running or Paced Running formula?
Can Work be used as a more definitive measure of FP and actions that consume FP?

The Reply


It's a game, an abstraction.

You're overthinking it.

Forget about system, keep working on your interesting setting, where attention to detail makes things more fun ;)

Thanks for the compliment :)

I've been bothered about a more tangible way to measure FP. Given all the data available you can get online about soldiers and athletic performance, I got really curious about the physics involved.

Using this Calorie Counting website I've tried to break down the following:

Hiking (per hour), Paced Running (per Minute), and Running (per 15sec) are the most available precedent of judging effort or work.

Hiking 2miles an hour 202lbs is 712 calories or 2.8KWatts*h
Paced Running 1min is 13 calories or 52 Watts*s
Running 15seconds 5.5 calories or 22 Watts

I think I'm missing a way to measure intensity?

Its just a curiosity. Its always bugging me that there could a be a more exacting way to measure work and would be grateful with any input.

ST 10 allows doing 120 ft-lb of work in one second. It doesn't allow doing that much every second in a continual manner.
Swinging a sword at about 162 joules basically boils down to about 162/1.35kg or 120m/s (270mph). Only traveling an arc of 2m, that would be 1/60th of a second? At 162 joules a leverage damage is 1d+1 cr (heavy wooden sword).

compared to a golf ball that travels 180mph, a tennis ball is capable of 150mph.

Increasing the mass to a 5lb round mace (traveling at the same speed) is 270joules at roughly 1d+2cr. ST12 can generate speeds of up to 172m/s or 388J with a 5lb mace (2dcr). 388J being able to penetrate DR7 15C Plate with a Flanged Mace (sw+3cr) one handed emphasizes to one's imagination the amount of force needed to penetrate.

Playing with the math, generating as much as 388J is like grabing a 1.5kg tennis ball and tennis smashing at something at 155mph.

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