# A calculation on thermal energy from friction.

1. Sep 25, 2011

### Physics quest

Hello, I am new here and I joined because I was wondering if I could find any help concerning finding heat from friction.

The question is fictional, I am not talking about something that has happened, but I am interested in a realistic calculation for the physics behind it.

in my problem, a guy slashes somebodies chest with a weapon, say a sharp instrument like a knife tip but the guys chest is incredible dense, it just slides off. The slash comes from right to left across the torso, no damage occurs but the guy getting striked gets knocked back.

The guy doing the striking has a ridiculous pressure of about 1 billion bar on the tip of the knife which slides an inch or so before coming free without causing any damage.

My question is, how much heat would be created at the tip of the knife as it slides across the other guys bare chest? without cutting it with these pressures? I imagine I need the coefficent of friction on skin, I have the force in newtons (3.9mega newtons) in the guys arm/body doing the slashing.

Is this possible to calculate? thanks to any answers.