Some cars go further than others, but all of them stop in the end. Explain why they stop.

Cars stop for a variety of reasons:

1. Fuel Depletion: Cars run on fuel, whether it's gasoline, diesel, or electricity. When the fuel source is depleted, the car will stop because it no longer has the energy to power the engine or motor.

2. Mechanical Failure: Cars are complex machines with many moving parts. If any of these parts fail, such as the engine or transmission, the car will stop.

3. Driver Intervention: Cars are typically controlled by a driver. If the driver applies the brakes, the car will stop. This is often done to obey traffic laws, avoid obstacles, or park the vehicle.

4. Environmental Factors: Sometimes, external factors can cause a car to stop. This could be anything from a flat tire to a road that's too steep to climb.

5. Safety Systems: Modern cars have numerous safety systems designed to prevent accidents. If these systems detect a potential problem, they may automatically stop the car. For example, some cars have automatic braking systems that stop the car if they detect an obstacle in the path of the vehicle.

In conclusion, cars stop due to a combination of factors related to fuel, mechanical integrity, driver control, environmental factors, and safety systems.