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Vehicle Safety Systems Research

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Vehicle Safety Systems Research

Read the evidence brief, analyse the supplied data and use physics ideas to evaluate how restraint systems and crumple zones reduce injury risk. Show calculations and justify conclusions. Treat the data as a simplified model, not a substitute for real vehicle testing.

Evidence brief: what happens in a crash?

In a frontal collision, a vehicle and its occupants lose momentum. A restraint helps the occupant slow down with the vehicle rather than continue moving forward. A lap belt restrains the pelvis; a three-point belt adds a diagonal sash across the chest and pelvis. A five-point harness restrains the pelvis and shoulders at five attachment points and is used in settings such as motorsport and some child restraints. Correct fit and the vehicle’s design matter; no restraint makes a crash harmless. A crumple zone is a region designed to deform in a controlled way. Deformation can absorb energy and increase the time over which the vehicle’s momentum changes. In a simplified model, average force is related to impulse: F_avg = Δp/Δt. Increasing stopping time for the same momentum change reduces average force. The passenger compartment is designed to resist intrusion, while restraints and other systems help manage occupant motion. For this investigation, assume each test vehicle has the same mass and initial speed, and each occupant has the same momentum change. The measurements below are hypothetical classroom data. Real crash outcomes also depend on impact direction, intrusion, restraint fit, occupant characteristics and many other factors.

Test condition

Stopping time (s)

Average force (N)

Rigid impact model

0.020

Calculate

Controlled crumple-zone model

0.120

Calculate

Analyse and evaluate

Use evidence from the brief and data. Answers should distinguish model results from claims about real-world safety.

1.In the simplified model, calculate the average force for each impact condition using F_avg = Δp/Δt. Include units and complete the data table.

2.How many times greater is the modelled average force in the rigid-impact test than in the controlled crumple-zone test? Show the ratio.

3.Explain, using momentum and impulse, why extending stopping time can reduce average force when the momentum change is the same.

4.Select the best description of a crumple zone’s main safety role.

It prevents the vehicle from changing momentum.
It deforms in a controlled way, absorbing energy and helping increase collision time.
It makes the passenger compartment deliberately collapse first.
It guarantees that occupants experience zero force.

5.A three-point belt has a lap section and a diagonal sash. Describe how these sections help restrain an occupant, and explain why correct fit matters.

6.True or false: Because a five-point harness has more attachment points than a three-point belt, it is automatically the best restraint for every vehicle occupant and every journey. Explain your choice.

7.Identify one important limitation of the supplied impact-force comparison. Suggest one additional variable or measurement that a more realistic investigation should include.

8.A design team proposes making the entire front of a car extremely rigid to prevent visible damage. Evaluate this proposal using the evidence brief. Include a benefit or design goal, a safety concern, and a more balanced design approach.

9.A manufacturer can choose between a cheaper design that meets only a minimal internal target and a more thoroughly tested design that reduces risk across a wider range of crash conditions. State two ethical responsibilities the manufacturer should consider and justify one.