- #1

- 20

- 0

## Main Question or Discussion Point

I suppose this sounds a little silly, but:

Momentum has to be conserved, but often at the cost of some kinetic energy. For example, if someone throws a 1kg mass at 50kg person at 10 m/s, he catches it:

mv=mv

(1)10=v(51)

v=10/51

KE1=.5(1)(10)^2=50j

KE2=.5(51)(10/51)^2=.98j

Heat is thus created, but my question is: where? I suppose in this situation it would be in the glove... but how exactly does that heat come about? Heat is, I guess, kinetic energy on a smaller scale (moving particles). How do these particles begin to move?

Momentum has to be conserved, but often at the cost of some kinetic energy. For example, if someone throws a 1kg mass at 50kg person at 10 m/s, he catches it:

mv=mv

(1)10=v(51)

v=10/51

KE1=.5(1)(10)^2=50j

KE2=.5(51)(10/51)^2=.98j

Heat is thus created, but my question is: where? I suppose in this situation it would be in the glove... but how exactly does that heat come about? Heat is, I guess, kinetic energy on a smaller scale (moving particles). How do these particles begin to move?