Question

Four similar cars having exactly the same mass are running at the same speed on the same road when brakes are applied at the same time. The cars come to a stop after covering distances of 5 m, 5.5 m, 4.8 m and 5.2 m respectively. The friction between the brake pads and discs will be the maximum in the car which travels the distance of:
A. 5 m
B. 5.5 m
C. 4.8 m
D. 5.2 m

Answer 1

Answer:

maybe 5.5 meter is the ans

Answer 2

C. 4.8 m

Explanation:

Friction is a phenomenon which resists motion when an object is rubbed against another. So friction has instances where it is desired and instances where it is not desired. In the case of automobiles, friction is desired when we wish to stop the moving car and friction is less desired when it creates a drag on the movement of the vehicle.

Given the case, all four cases have same mass and speed. So the effectiveness of the brake is with the smallest distance traveled after the brake where friction is the maximum.

Option C is the answer.