Question

Во сколько раз отличаются минимальные длины тормозного пути автомобиля при торможении на сухом асфальте и гладком льду? Считайте, что дорога в обоих случаях горизонтальная, а скорость автомобиля перед началом торможения в обоих случаях одинаковая. ОТДАЮ 100 БАЛЛОВ!!!

Answer 1

S=(V² - Vo²)/(-2a)

V=0

S=Vo²/2a

Fтр=kmg=ma

a=kg

S1/S2=(Vo²/k1g) : (Vo²/k2g)=k2/k1.

Тормозной путь во столько раз меньше, во сколько раз больше коэффициент трения. Найдите значения для k резина по асфальту и резина по льду.

Answer 2

Calculating the Difference in Stopping Distances on Dry Asphalt and Smooth Ice

When comparing the minimum stopping distances of a car on dry asphalt and smooth ice, it's important to consider the factors that affect braking on these surfaces.

Dry Asphalt: The stopping distance on dry asphalt is affected by factors such as the coefficient of friction between the tires and the road, the speed of the car, and the efficiency of the braking system.

Smooth Ice: On smooth ice, the stopping distance is significantly longer due to the reduced friction between the tires and the icy surface.

To calculate the difference in stopping distances, we can use the formula for stopping distance, which is the sum of the thinking distance and the braking distance.

Thinking Distance: The thinking distance is the distance the car travels during the driver's reaction time. It is directly proportional to the initial speed of the car.

Braking Distance: The braking distance is the distance the car travels while the brakes are applied. It is affected by the coefficient of friction between the tires and the road surface.

Given that the road is horizontal and the initial speed of the car is the same in both cases, we can focus on the braking distance to compare the stopping distances on dry asphalt and smooth ice.

Difference in Stopping Distances

The difference in stopping distances on dry asphalt and smooth ice can be significant. The braking distance on smooth ice is much longer due to the reduced friction, leading to a substantial increase in the overall stopping distance.

Conclusion: The difference in stopping distances on dry asphalt and smooth ice can be substantial, with the stopping distance on smooth ice being significantly longer due to the reduced friction between the tires and the icy surface.