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Difficulty: MediumBalance and Center of Gravity

Placing the heaviest items of a mixed freight shipment on top of lighter goods helps lower the vehicle's center of gravity and improves roll stability during sharp turns.

Answer: Answer

Answer

False. Heavy cargo must be loaded directly on the trailer floor to keep the vehicle's center of gravity low and minimize rollover hazards.
The statement is false because stacking dense freight on top of lighter cargo shifts the vehicle's center of gravity upward. A higher center of gravity makes commercial motor vehicles significantly more prone to rolling over during cornering, lane changes, and emergency evasive steering. Commercial drivers must ensure that heavy freight is placed directly on the trailer bed and spread evenly.

Step-by-Step Solution

1
Identify the relationship between cargo placement height and the vehicle's center of gravity.
Loading dense, heavy items on top of lighter goods raises the overall center of gravity higher from the ground.
Center of gravity is determined by the vertical and lateral distribution of all mass in the vehicle.
2
Analyze how an elevated center of gravity affects handling and roll stability.
A high center of gravity creates a greater tipping leverage during turns, increasing the tendency to roll over.
Centrifugal force exerts greater rotational torque around the roll axis when mass is concentrated high above the axle track.
3
Determine the validity of the statement.
The statement is false because top-loading heavy items degrades stability rather than improving it.
Safe cargo loading requires placing the heaviest freight as low as possible and centered side-to-side.

Key Concept

Vertical Cargo Distribution and Center of Gravity
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Topics

Balance and Center of Gravity

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