Question

how do seatbelts act within the system to counter this effect and keep passengers safe? seatbelts provide a balanced force that stops the forward motion of the passengers. seatbelts reduce the cars velocity to match that of the passengers. seatbelts provide an opposite force that opposes the passengers forward motion. seatbelts absorb the cars energy to keep the passengers in motion.

Explanation:

Seat - belts work based on Newton's laws of motion. When a car suddenly stops or crashes, passengers tend to keep moving forward due to inertia. Seat - belts provide an opposite force to stop this forward motion and keep passengers safe.

Answer:

Seatbelts provide an opposite force that opposes the passengers' forward motion.