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Difficulty: MediumRoof Racks and Roof Boxes

Carrying luggage on top of a car alters how the vehicle handles. How does a loaded roof rack affect the car when driving around sharp bends?

  1. A
    It lowers the vehicle's centre of gravity, reducing body sway during turns
  2. It raises the vehicle's centre of gravity, causing the car to lean more heavily into cornersAnswer
  3. C
    It reduces overall stopping distances by pressing the tyres harder against the road surface
  4. D
    It allows the driver to decrease recommended tyre pressures to improve tyre grip

Answer

A loaded roof rack raises the vehicle's centre of gravity, causing the car to lean more heavily into corners.
Placing items on a roof rack elevates the vehicle's overall centre of gravity. A higher centre of gravity reduces stability and increases lateral body roll whenever the vehicle changes direction or negotiates sharp corners.

Step-by-Step Solution

1
Analyze the physical effect of placing weight high on a vehicle's roof structure
Adding weight high up shifts the overall centre of mass upwards.
Mass distributed above the roofline significantly elevates the vehicle's centre of gravity.
2
Determine the impact of an elevated centre of gravity on cornering dynamics
Higher centre of gravity increases lateral roll forces during steering changes.
Centrifugal forces acting on higher mass create greater torque, causing the vehicle body to lean more outward in bends.

Key Concept

Impact of roof loads on vehicle centre of gravity and cornering stability
Estimated Time:45s
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Topics

Roof Racks and Roof Boxes

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