Science and nonsense in Science and nonsense in the martial artsthe martial arts

Science and nonsense in Science and nonsense in the martial artsthe martial artsNYC Skeptics SkeptiCamp 2010

John Rennie

NYC Skeptics SkeptiCamp 2010John Rennie

V = volume of block

δ= modulus of rupture ≈ stress material can handle

E = modulus of elasticity ≈ stiffness

V = volume of block

δ= modulus of rupture ≈ stress material can handle

E = modulus of elasticity ≈ stiffness

Critical energy to break a block = Vδ2/2ECritical energy to break a block = Vδ2/2E

F = ∆mv/∆t = (45 kg-m/s)/0.004 s ≈ 104 N F = ∆mv/∆t = (45 kg-m/s)/0.004 s ≈ 104 N

= 2,250 lbs.= 2,250 lbs.

Dim mak: death touch techniques?Dim mak: death touch techniques?