4.1 Compare the momentum of different moving objects
4.2 Identify examples of changes in momentum of an object
4.3 Explain how time has an impact on the force on an object
4.4 Compare the total momentum of two objects before and after collisions
4.5 Predict the final velocities of objects after collisions take place
4.6 Explain the changes (if any) in kinetic energy during elastic and inelastic collisions
4.7 Design a device that increases the time an impact takes place.