Calculating Punch Force to Break Concrete Slab

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SUMMARY

The discussion focuses on calculating the necessary punch speed to break a concrete slab, which requires 1900 Newtons of force. The user estimates their arm's mass at 8.4 kg and punch distance at 80 cm. Initial calculations using the formula F = ma suggest a punch speed of 226 m/s, which is deemed unrealistic. Participants emphasize the importance of considering impact area and maximum stress, indicating that pressure (force/area) is a critical factor in determining the effectiveness of the punch.

PREREQUISITES
  • Understanding of Newton's Second Law (F = ma)
  • Knowledge of basic physics concepts such as force, mass, and acceleration
  • Familiarity with stress and pressure calculations in materials
  • Basic principles of biomechanics related to human motion
NEXT STEPS
  • Research the concept of impact force and its relation to material failure
  • Learn about calculating pressure using the formula pressure = force/area
  • Investigate the biomechanics of punching techniques in martial arts
  • Explore advanced physics simulations for impact scenarios
USEFUL FOR

This discussion is beneficial for physics students, martial artists, and anyone interested in the mechanics of force application and material strength.

cybernerd
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Homework Statement


I am working on a physics project about karate, and I want to know how fast I would have to punch to break a practice concrete slab.

I know that the slab requires 1900 Newtons to break. I also know that my arm has an approximate mass of 8.4 kg. I also know that my arm is about 80 cm long, which is basically the distance my punch will travel.


Homework Equations



F = ma

The Attempt at a Solution



If I simply use F = ma, it tells me that I must punch at 226 m/s to break the concrete...that doesn't seem right to be. I know I'm probably oversimplifying the problem...could someone point me in the right direction?
 
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It's not just the mass of the hand/arm if there is muscle power behind it at impact
I think you might have to consider the area of the impact, the concrete has a maximum stress (force/area=pressure) that might be more important than the ulitmate load
 

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