jpatterson

06-03-2013, 09:08 PM

Hello, I am looking for some info from anyone more well versed in this type of math and physics question. I know you cannot directly convert pressure and force from one to the other without extra information, but I have a set of values below and I'd like to get some info on what to do with it and how.

Weight (lbs)

Feet/Second

Sq In.

Newtons

PSI

?

1.5

23

3.4

1400

1.5

46

3.4

2800

A. A 3.4 square inch, 1.5 lb. object can travel either 23 or 46 feet per second, and will yield a force of either 1400 or 2800 Newtons, appropriate to the speed.

B. How do I get the PSI (pounds per square inch) for both speeds?

C. What is the "pound" measurement for force (not PSI), that is equivalent to Newtons, and how do I get it? Something like "foot pounds" or "pounds of force". I am not sure which is the correct term and formula if I wanted to find out how much "force" an object has when it impacts, this force being the "pound" version of Newtons.

D. Essentially I am looking for a contextual "bridge" for "converting force to pressure" (Newtons to PSI), using this particular case just so I can understand the proper steps, for like objects and measurements.

Thank you to anyone who reads this, and moreso to anyone that can actually help with it.

PS: i found some data on hailstones, from pea sized to CD sized, that range in pounds of force from less than 1 to 250 pounds (also listed it in joules), when falling from the sky, and I wondered how that compared to say, a punch or various other things.

Weight (lbs)

Feet/Second

Sq In.

Newtons

PSI

?

1.5

23

3.4

1400

1.5

46

3.4

2800

A. A 3.4 square inch, 1.5 lb. object can travel either 23 or 46 feet per second, and will yield a force of either 1400 or 2800 Newtons, appropriate to the speed.

B. How do I get the PSI (pounds per square inch) for both speeds?

C. What is the "pound" measurement for force (not PSI), that is equivalent to Newtons, and how do I get it? Something like "foot pounds" or "pounds of force". I am not sure which is the correct term and formula if I wanted to find out how much "force" an object has when it impacts, this force being the "pound" version of Newtons.

D. Essentially I am looking for a contextual "bridge" for "converting force to pressure" (Newtons to PSI), using this particular case just so I can understand the proper steps, for like objects and measurements.

Thank you to anyone who reads this, and moreso to anyone that can actually help with it.

PS: i found some data on hailstones, from pea sized to CD sized, that range in pounds of force from less than 1 to 250 pounds (also listed it in joules), when falling from the sky, and I wondered how that compared to say, a punch or various other things.