Question

1. a person pushes on a wall. the wall doesnt move, but the person feels pressure in their hands. explain which law applies.
2. a car crash test shows that passengers not wearing seatbelts continue moving forward when the car stops. explain which law this demonstrates and why.

Explanation:

For question 19, Newton's third - law applies. When the person pushes on the wall (action force), the wall exerts an equal and opposite reaction force on the person's hands, causing the pressure feeling. For question 20, Newton's first - law (law of inertia) applies. Objects in motion tend to stay in motion. Passengers not wearing seatbelts have inertia and continue moving forward when the car stops due to the lack of an external force to stop their motion.

Answer:

1. Newton's third law applies because for every action (person pushing on wall), there is an equal and opposite reaction (wall pushing on person's hands).
2. Newton's first law (law of inertia) applies. Passengers have inertia and continue moving forward as they were in motion before the car stopped and no force stopped their forward motion.