I'm writing a program to simulate bullet impact on various materials. I need to know, will the angular momentum of a spinning bullet give it more impact force? I would assume that if so it would also mean that spinning bullets overcome more air friction if I am supposed to add the angular momentum to the linear forward momentum when calculating total forward momentum. I have to calculate two things: 1. Penetration depth of the impact material 2. How much air friction will slow down the bullet. Both will require assumptions about weather or not angular momentum adds to linear momentum when calculating total forward momentum felt by the air or the impact material.