Question

A layer of padding is added to car dashboards because it can reduce some injuries during a
collision. How does the padded dashboard make people safer?
Increases the force of impact in a collision
Decreases the momentum of a collision
Decreases the impulse in a collision
Increases the time of impact in a collision
a

Answer 1

The relationship between impulse and momentum allows finding the result of how the padded board makes people safer is:

   c) Increases the time in the collision.

Impulse is the amount of force applied per unit time and is related to change momentum.

      I = ∫ F dt = Δp

Where the bold letters indicate vectors, I is the momentum, F the force, t the time and p the moment.

The momentum is defined as the product of the mass and the speed of the vehicle.

     p = m v

In that case we have that whencollides the final velocity is zero, in average impulse it is

           F Δt = 0- m v

           F = $- \frac{m v}{\Delta t}$  

The negative sign indicates that the force is on the occupants of the vehicle.

To reduce injuries to vehicle occupants we must reduce the force acting on them, we have two options:

• Slow down the speed. This option is difficult as the cars go faster.

• Increase the time. This option more possible, with materials that increase the duration of the shock, deformable materials can be used.

Let's analyze the different claims:

a) False. Material does not change vehicle speed.

b) False. The board material does not change the impact force.

c) True. The material increases the impact time since it deforms a greater distance.

In conclusion, using the relationship between impulse and momentum, we can find the result of how the padded board makes people safer is:

              c) Increase the shock time.

Learn more here:  https://brainly.com/question/904448

Answer 2

Answer:

Answer is C. Hope that helped