Question

1. two moving objects are set to collide with each other. which property of the objects will most affect the magnitudes of their momentum?

a. mass
b. volume
c. temperature
d. shape

1. the image shows a cars front and rear crumple zones.

crumple zones are areas that collapse during a collision and are standard safety features in modern cars. how do crumple zones increase passenger safety during a collision? select the correct answers.
a. by reducing the change in momentum
b. by changing the total mass of the system
c. by decreasing the time of impact
d. by maintaining momentum

define:
conservation of momentum:

1. what is true about momentum after your head collides with the ground?

a. the ground gains some momentum.
b. your head loses momentum.
c. the total amount of momentum is the same.
d. all of the above

Explanation:

1. The momentum formula is $p = mv$ (where $p$ is momentum, $m$ is mass and $v$ is velocity). Mass directly affects momentum magnitude. Volume, temperature and shape do not have a direct impact on the basic formula for momentum.
2. Crumble - zones work by increasing the time of impact during a collision. According to the impulse - momentum theorem $J=\Delta p = F\Delta t$. By increasing $\Delta t$, the force $F$ on passengers is reduced. They do not change the total mass of the system or reduce the change in momentum (which is determined by the initial and final states of the car's motion), and they do not maintain momentum in the sense of preventing a change.
3. According to the law of conservation of momentum, in a closed system (in this case, the head - ground system), the total amount of momentum before and after the collision remains the same. When the head collides with the ground, the head loses momentum and the ground gains some momentum (although the mass of the ground is so large that its velocity change is negligible).

For the definition of conservation of momentum: In a closed system, the total momentum before an interaction is equal to the total momentum after the interaction.

Answer:

1. A. Mass
2. None of the above (the correct reason is increasing the time of impact to reduce force).
3. D. All of the above

Conservation of Momentum: In a closed system, the total momentum before an interaction is equal to the total momentum after the interaction.