MOMENTUM AND IMPULSE Chapter 9 What factors affected how fast objects move after a collision? (Think of your lab) SECTION 1: MOMENTUM AND IMPULSE Linear Momentum: Momentum is defined as mass times velocity. Momentum is represented by the symbol p, and is a vector quantity. p = mv momentum = mass velocity Momentum describes an objects motion SI unit for momentum is kg•m/s The faster you move, the more momentum you have and the more difficult it is to stop.