8. Anti-Weight
A. Compensate for the object's weight by joining with another object that has a lifting force.
Example:
• Use helium balloon to support advertising signs.
• Boat with hydrofoils.
B. Compensate for the weight of an object by interaction with an environment providing aerodynamic or hydrodynamic forces.
Example:
• Hydrofoils lift ship out of the water to reduce drag.
• A rear wing in racing cars which increases pressure from the car to the ground.
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