How do tests with crash dummies seat belts and air bags illustrate newtons first low of motion

Newton’s first law of motion is also known as the Law of Inertia, wherein an object at rest will remain at rest while an object in motion will stay in motion with the same speed and direction unless it is acted upon by an unbalanced force. The seatbelts and airbags in a car provide this stopping force for the crash test dummy. Without these two components in a car, rate of death in car accidents would increase. 

Select the word from the list that best fits the definitionstates the the universe is expanding

No has to have commas in it