Calculate the exit force of a bullet leaving the barrel

Click For Summary
SUMMARY

The discussion focuses on calculating the exit force of a bullet as it leaves the barrel of a firearm, utilizing parameters such as mass (12.96 g), barrel length (0.6985 m), energy from gunpowder (6734 J), and a friction coefficient (0.5). Participants emphasize the importance of understanding the energy budget in interior ballistics, referencing Hatcher's Notebook by Julian S. Hatcher as a valuable resource. The challenge lies in translating these physical parameters into MATLAB for computational analysis.

PREREQUISITES
  • Understanding of basic physics principles, specifically Newton's laws of motion.
  • Familiarity with interior ballistics concepts and energy transfer.
  • Basic knowledge of MATLAB for computational modeling.
  • Knowledge of friction coefficients and their impact on motion.
NEXT STEPS
  • Read "Hatcher's Notebook" by Julian S. Hatcher to grasp energy budgets in ballistics.
  • Learn how to implement physics equations in MATLAB for simulations.
  • Research the effects of friction on projectile motion in firearms.
  • Explore advanced topics in interior ballistics, including pressure and velocity calculations.
USEFUL FOR

Ballistics engineers, firearms enthusiasts, physics students, and anyone interested in the dynamics of projectile motion and energy transfer in firearms.

JJ_Badoo
Messages
1
Reaction score
0
TL;DR
Hello, I am doing a project in which I have a bullet and it is being fired from a barrel.
So, Basic premise is I have 1 input and one output, Energy friom the gunpower burning is input, and the output is the force which pushes the bullet after it is reduced by the friction.

m = 12.96 g
s = 0.6985 m (barrel lenght)
E = 6734 J
k = 0.5 (friction coeffcient)

I am sorry for lack of anything really. I don't even know how to start, I could solve the exercise normally but them shifting it over to MATLAB parameters is the most difficult thing for me...
Thank you.

https://www.physicsforums.com/attachments/245431
 
Physics news on Phys.org
Hello JJ, ##\qquad## :welcome: ##\qquad## !

For the friction force you write ##-kx##. Where does that come from ? What would it mean for the energy lost to friction ?

JJ_Badoo said:
I am sorry for lack of anything really. I don't even know how to start
Not good enough for PF -- see guidelines
I could solve the exercise normally
Please do solve, and post what you have, including thte relevant equations ...
 
JJ_Badoo said:
I don't even know how to start

Do some reading on interior ballistics. Hatcher's Notebook, by Julian S. Hatcher, has some good information on the energy budget, including friction.
 

Similar threads

Modeling Air Compression Cylinder
  • · Replies 45 ·
2
Replies
45
Views
6K
Calculating force on a bullet, given mass + velocity + barrel length
  • · Replies 2 ·
Replies
2
Views
17K