Why do cars seem to decelerate faster when at a higher speed than at a lower speed?

Question

When exiting off of an interstate, why does the car seem to go from 75mph to 50mph faster than 25mph to 0mph? The road composition, grade of the road, or the tires on the vehicle never changed, yet the car seems to maintain its velocity at the slower speeds.

In: Physics

Answer 1

The limit of braking is tire grip. If you lose grip and start to slide, you’re not slowing down efficiently. Under heavy braking at high speed, the car leans forward a lot and puts weight on the front tires. The extra weight gives the front tires more grip. As the car loses speed, it loses weight in the front giving you less grip. If you continued braking hard, the car would want to slide. You hopefully aren’t near the grip limit on public roads but, faster cars can brake harder without sliding.