ot : anyone know physics

[jimbo78]

Specifically as it relates to the human body?

I was curious as to how much more force is generated stepping down from 22 inches vs 12 inches . Lets say on a 200lb person.

 

[dbenyo]

what do you mean by as it relates to the human body?

 

[mrx66699]

A little research shows that gravity accelerates objects downward at 9.8 m/s^2. How much downward force does the man generate with each step he takes? How much work is performed when gravity pulls him down 22in after each step? Must first remember that when talking about gravity at anything below 20000 feet it is rendered irrelevant. Secondly the gravity constant is more commonly referred to as 9.81. And finally the work that gravity gives effect on is really simply:

Fz (gravity) = m (mass) * g (gravity constant) Force = m * g = 200 * 9.8 = 1960 N

Work done = F * d = 1960 * 22 = 43120 J

 

[dbenyo]

You have to convert the inches to meters and the pounds to kg but the equations are right.

 

[AquamanE]

you go Matt (MrX)- you teaching this to the Kindergarden kids???

 

[jonnyu]

you go Matt (MrX)- you teaching this to the Kindergarden kids???

Lmao
I'm going to have to send my kids to his elementary school lol

 

[Lacy]

A little research shows that gravity accelerates objects downward at 9.8 m/s^2. How much downward force does the man generate with each step he takes? How much work is performed when gravity pulls him down 22in after each step? Must first remember that when talking about gravity at anything below 20000 feet it is rendered irrelevant. Secondly the gravity constant is more commonly referred to as 9.81. And finally the work that gravity gives effect on is really simply:

Fz (gravity) = m (mass) * g (gravity constant) Force = m * g = 200 * 9.8 = 1960 N

Work done = F * d = 1960 * 22 = 43120 J

What he said. :lol2: :lol2: :lol2: Ok. I would have had to Google.

Matt, when did you start teaching? Last I remember you had your own business.

 

[jimbo78]

So at 12 inches it would be basically 23520j . I guess that means about double the force on joints.

 

[rovster]

Now you have to calculate the load limit of the joints, factor in coefficients for genetics musculature and age, as well as hardness and expansion coefficients for the shoes socks and floor surface, and then maybe we can have a meaningful discussion......:lol:

 

[Motor16]

Bottom line? This doesn't belong on "Reef Central"

 

[dbenyo]

So at 12 inches it would be basically 23520j . I guess that means about double the force on joints.

Its only 267

You calculated something that is over 400lbs and 36ft in the air by not converting units.

 

[props4you]

Wow Matt...lol...impressive !

 

[jimbo78]

Its only 267

You calculated something that is over 400lbs and 36ft in the air by not converting units.

So without the whole matt write up. What is it at 12 and what at 22

 

[mrx66699]

As stated earlier you need to convert in to m and lbs to kg but the formula is correct

 

[mrx66699]

Matt, when did you start teaching? Last I remember you had your own business.

Renee I have always worked for the school board net administration and training for 15yr and teaching for the last 4 .....sold my advetising business a few yrs back ........bs in civil engineering is my roots

 

[dbenyo]

So without the whole matt write up. What is it at 12 and what at 22

about 271 vs 497 (potential energy) it will still be about double because the distance is almost doubled.

 

[Lacy]

Renee I have always worked for the school board net administration and training for 15yr and teaching for the last 4 .....sold my advetising business a few yrs back ........bs in civil engineering is my roots

Never knew you were a teacher.

 

[Lacy]

Bottom line? This doesn't belong on "Reef Central"

Wow! Very friendly of you. :hammer:

 

[sarko]

Bottom line? This doesn't belong on "Reef Central"

And that's why there is a OT

 

[Gillguy]

A little research shows that gravity accelerates objects downward at 9.8 m/s^2. How much downward force does the man generate with each step he takes? How much work is performed when gravity pulls him down 22in after each step? Must first remember that when talking about gravity at anything below 20000 feet it is rendered irrelevant. Secondly the gravity constant is more commonly referred to as 9.81. And finally the work that gravity gives effect on is really simply:

Fz (gravity) = m (mass) * g (gravity constant) Force = m * g = 200 * 9.8 = 1960 N

Work done = F * d = 1960 * 22 = 43120 J

I have no freakin idea what you just wrote but both of my daughters who know their physics advised that you are correct. Well done!!!