Question

1. why is it important to regularly maintain safety features on a vehicle?

list two specific features that need regular maintenance on a vehicle.

read pages 292-297 in the science connect 2 textbook

1. what advantages does a three point belt have over a lap belt in a collision?

Explanation:

Question 20

• Regular maintenance ensures safety features function correctly during a crash to prevent failure.
• Two specific features requiring maintenance: brakes and airbags/seatbelts.

Question 21

• A three-point belt secures both the upper body (torso) and lower body (pelvis), whereas a lap belt only secures the pelvis.
• It distributes the impact force over a wider area of the body (chest, shoulders, and pelvis) and prevents the upper body from flying forward and hitting the steering wheel or dashboard.

Answer:

Question 20

Regular maintenance ensures that safety systems function reliably during an emergency or collision, preventing mechanical failure when they are needed most.

Two specific features that need regular maintenance:

1. Brakes (to ensure adequate stopping power and prevent wear)
2. Seatbelts (to check for fraying, tensioner function, and locking mechanism reliability)

Question 21

A three-point belt secures both the pelvis and the upper torso, whereas a lap belt only secures the pelvis. This provides two main advantages:

1. Force Distribution: It spreads the impact force over stronger skeletal areas (shoulders, chest, and pelvis) rather than concentrating it solely on the abdomen.
2. Movement Prevention: It keeps the upper body from whipping forward, preventing the head and chest from colliding with the dashboard, steering wheel, or front seats.