Why its harder to stop a moving car?

It’s harder to stop a moving car due to its momentum, which is the product of its mass and velocity. The greater the speed and weight of the vehicle, the more force is required to bring it to a halt, as described by Newton's second law of motion (F=ma). Additionally, the friction between the tires and the road affects how quickly the car can stop; if the road is wet or icy, stopping distances can increase significantly.