1. What is the basic SI unites for momentum and impulse? 2. Know whether impulse and momentum are vector or scalar quantities. 3. What does it mean for a system to be isolated? 4. Differentiate between external and internal forces. 5. Differentiate between elastic and inelastic collisions. 6. Know which type of inelastic collision produces the greatest loss of kinetic energy. 7. Know what happens to kinetic energy in an inelastic collision. 8. Understand and apply Newton's Third Law of Motion. I am having a little difficulty understanding these stuff. Can anyone help a little bit? Thanks, J.