Question

select the correct answer from each drop-down menu. danica observes a collision between two vehicles. she sees a large truck driving down the road. it strikes a small car parked at the side of the road. complete the passage summarizing the collision. on colliding, the truck applies a force on the stationary car, and the stationary car applies dropdown and opposite force on the truck. the front of the truck is designed to crumple in order to dropdown, which protects the well-being of the passengers.

Explanation:

To solve this, we analyze the physics concepts:

First Drop - Down (Force Interaction)

By Newton's third law of motion, when two objects interact (like in a collision), the forces they exert on each other are equal in magnitude and opposite in direction. So the stationary car applies a equal (in magnitude) and opposite force on the truck.

Second Drop - Down (Crumple Zone Purpose)

The front of the truck crumples to increase the time over which the collision force acts. From the impulse - momentum theorem ($J = F\Delta t=\Delta p$), if the time $\Delta t$ of the collision increases, the force $F$ (experienced by passengers) decreases. So the crumpling is to increase the time of the collision (or equivalently, reduce the force on passengers, but the key concept here is about time - force relationship in collisions).

For the first drop - down, the answer is "an equal" (since the force from the car on the truck is equal in magnitude to the force from the truck on the car, as per Newton's third law). For the second drop - down, a common correct option is "increase the time of the collision" (to reduce the impact force on passengers).

(Note: If the drop - down options for the second part include things like "increase the time of impact" or "decrease the force on passengers" (derived from increasing time), those would also be correct. The first part is based on Newton's third law of action - reaction forces being equal and opposite.)

Final Answers (assuming typical options)

First drop - down: equal
Second drop - down: increase the time of the collision (or equivalent phrasing about reducing force via increasing time)

Answer:

To solve this, we analyze the physics concepts:

First Drop - Down (Force Interaction)

By Newton's third law of motion, when two objects interact (like in a collision), the forces they exert on each other are equal in magnitude and opposite in direction. So the stationary car applies a equal (in magnitude) and opposite force on the truck.

Second Drop - Down (Crumple Zone Purpose)

The front of the truck crumples to increase the time over which the collision force acts. From the impulse - momentum theorem ($J = F\Delta t=\Delta p$), if the time $\Delta t$ of the collision increases, the force $F$ (experienced by passengers) decreases. So the crumpling is to increase the time of the collision (or equivalently, reduce the force on passengers, but the key concept here is about time - force relationship in collisions).

For the first drop - down, the answer is "an equal" (since the force from the car on the truck is equal in magnitude to the force from the truck on the car, as per Newton's third law). For the second drop - down, a common correct option is "increase the time of the collision" (to reduce the impact force on passengers).

(Note: If the drop - down options for the second part include things like "increase the time of impact" or "decrease the force on passengers" (derived from increasing time), those would also be correct. The first part is based on Newton's third law of action - reaction forces being equal and opposite.)

Final Answers (assuming typical options)

First drop - down: equal
Second drop - down: increase the time of the collision (or equivalent phrasing about reducing force via increasing time)