Question

multiple choice

1. which factor gives the greatest momentum?

a) 70 kg swimmer at 3 m/s
b) 0.5 kg ball at 30 m/s
c) 0.01 kg bullet at 600 m/s
d) 1000 kg car at 0.5 m/s

1. crumple zones reduce collision forces by:

a) decreasing time of impact
b) increasing time of impact
c) increasing velocity change
d) decreasing mass of vehicle

1. which seatbelt provides best protection?

a) lap belt
b) two-point belt
c) three-point belt
d) no belt

short answer

1. a truck (2400 kg) moves at 15 m/s. calculate momentum.

1. a 2000 kg car at 30 m/s takes 10 s to stop. calculate braking force.

1. why do airbags inflate in 0.03 s?

1. name two road features redesigned for safety (e.g., guardrails, crash cushions).

Explanation:

Calculate momentum values for Question 1

$$
LATEXBLOCK0
$$

Analyze conceptual safety questions (Questions 2, 3, 6, 7)

$$
LATEXBLOCK1
$$

Compute numerical values for Questions 4 and 5

$$
LATEXBLOCK2
$$

Answer:

No.	Answer
2	(B) Increasing time of impact
3	(C) Three-point belt
4	\(36000 \text{ kg}\cdot\text{m/s}\)
5	\(6000 \text{ N}\)
6	To fully deploy before the occupant's body moves forward and collides with the interior.
7	Guardrails and crash cushions