The physics of human motion (re. a sword swing)

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SUMMARY

The discussion focuses on the physics of human motion, specifically analyzing the mechanics of a sword swing. Key calculations indicate that swinging a 10 lb sword involves approximately 20-25 Joules of energy, derived from the formula K = P = mgh. The swing's arc is measured from the shoulder, which serves as the pivot point. The calculated sword speed during the swing is approximately 30 ft/sec, highlighting the significant forces at play in this motion.

PREREQUISITES
  • Understanding of basic physics concepts such as energy and motion
  • Familiarity with the formula for gravitational potential energy (K = P = mgh)
  • Knowledge of projectile motion principles
  • Basic biomechanics related to human movement
NEXT STEPS
  • Research the principles of angular momentum in human motion
  • Explore the biomechanics of swinging tools and weapons
  • Learn about energy transfer during physical activities
  • Investigate the effects of mass and speed on swing dynamics
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This discussion is beneficial for physics enthusiasts, sports scientists, martial artists, and anyone interested in the biomechanics of human motion and weapon handling.

Adam
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Hello all, another question.

Can anyone explain to me please the details of, for example, a person swining a sword? How much body mass is involved, from which point do I measure the arc of the swing, how much energy is involved, et cetera?

Thanks.
 
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Assuming that you can throw ~10 lb sword (or other 10 lb mass) about 15-20 ft up you get K = P = mgh ~ 20-25 Joules, sword speed v=(2gh)1/2 ~ 30 ft/sec.

Swing point - your shoulder.
 
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