Liquid and Gas
Objects experience lift and drag when they travel through all kinds of gases, not just air. A spacecraft entering another planet’s atmosphere experiences drag. If it were the right shape, it could also
produce lift. Objects moving through liquids also experience lift and drag. The streamlined shape of a fish enables it to slip through water easily with minimum drag. Ships and submarines experience drag as they move through water. Ships called hydrofoils have underwater wings. As a hydrofoil accelerates, its underwater wings produce lift, and the ship’s hull rises up out of the water.
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SEE ALSO:
• Aerodynamics • Aircraft Design
• Bernoulli’s Principle • Force
• Glider • Laws of Motion • Thrust
• Weight and Mass • Wing
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