Discuss why a large truck takes longer to stop than a small car, both traveling at the same speed. Introduce the concept of momentum as inertial in motion. Inertia involves mass and velocity. momentum can be mathematically designated as mass x velocity. Discuss what changes in mass and /or velocity will cause a change in momentum. Show he progression from force to change in velocity to change in acceleration, ending in a change in momentum (impulse). Discuss the two factors involved in impulse and momentum change, force and time. Elicit how force x time + impulse and an impulse is a change in momentum (delta) mv. Derive how ft=delta mv.