Yeah, I'm thinking of energy, but in this case I'm assuming the terminal ballistics will dump all the bullet's energy into the block that's hit (that it won't p

Yeah, I'm thinking of energy, but in this case I'm assuming the terminal ballistics will dump all the bullet's energy into the block that's hit (that it won't penetrate all the way through the block). Impulse is force over a period of time; in this case, doesn't it equals the same thing?