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Question

Difficulty: MediumLoading the Vehicle Safely

You have fitted a roof rack and loaded it with luggage for a journey. How will carrying this overhead load affect your vehicle's handling and stability?

  1. A
    It will lower the centre of gravity, making the vehicle less sensitive to crosswinds.
  2. It will raise the centre of gravity, increasing body roll and making the vehicle more vulnerable to side winds.Answer
  3. C
    It will shorten stopping distances by generating additional downward aerodynamic grip at higher speeds.
  4. D
    It will allow you to reduce tyre pressures below standard levels to improve ride comfort.

Answer

It will raise the centre of gravity, increasing body roll and making the vehicle more vulnerable to side winds.
Loading items on a roof rack raises the vehicle's centre of gravity. This makes the car significantly less stable, causing increased body roll when negotiating bends and making the vehicle far more susceptible to buffeting from strong side winds.

Step-by-Step Solution

1
Analyze the physical effect of positioning weight on top of the vehicle.
Placing heavy items on a roof rack shifts the vehicle's overall centre of mass upwards.
Mass distributed high above the axles changes the vehicle's balance point.
2
Evaluate how a higher centre of gravity impacts cornering and aerodynamic stability.
The vehicle experiences greater body roll during turns and is pushed more easily by side winds.
A higher centre of gravity amplifies lateral forces acting on the vehicle body.

Key Concept

Impact of overhead vehicle loading on centre of gravity and lateral stability
Estimated Time:45s
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Topics

Loading the Vehicle Safely

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