The time that it takes to stop depends on the momentum of the truck rather than the type of brakes. I think that truck and car breaks are basically the same, so the difference is due to momentum (movement of an object in a particular direction). The amount of momentum depends on the weight (mass) of the truck, and how fast it is going (velocity, which describes the rate and direction of movement. eg. 80kph in a straight line).
So the equation for momentum is:
Momentum = Mass x Velocity
A truck will have a greater momentum, as its mass, or weight, is much bigger than that of a car. So if a car and a truck are driving at the same speed, and the mass of the truck is twice as much as the car, the momentum of the truck will be twice as great. Therefore, it will take the truck longer to stop, even if the car and the truck break at the same time.
The same thing would happen if you and a friend were running down a hill. You both run at the same speed then try to stop at the same time. If you are bigger than your friend (you have a greater mass) then you will have more momentum and it will take you longer to stop. If you are smaller than your friend (have a smaller mass) then you will have less momentum and be able to stop more quickly.
The time that it takes to stop depends on the momentum of the truck rather than the type of brakes. I think that truck and car breaks are basically the same, so the difference is due to momentum (movement of an object in a particular direction). The amount of momentum depends on the weight (mass) of the truck, and how fast it is going (velocity, which describes the rate and direction of movement. eg. 80kph in a straight line).
So the equation for momentum is:
Momentum = Mass x Velocity
A truck will have a greater momentum, as its mass, or weight, is much bigger than that of a car. So if a car and a truck are driving at the same speed, and the mass of the truck is twice as much as the car, the momentum of the truck will be twice as great. Therefore, it will take the truck longer to stop, even if the car and the truck break at the same time.
The same thing would happen if you and a friend were running down a hill. You both run at the same speed then try to stop at the same time. If you are bigger than your friend (you have a greater mass) then you will have more momentum and it will take you longer to stop. If you are smaller than your friend (have a smaller mass) then you will have less momentum and be able to stop more quickly.
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