reaction force; normal force and friction
Physics term for the force a surface exerts on an object in contact with it, including normal and frictional components.
Drag is proportional to the square of the velocity.
When an object is on a desk, a reaction force acts on the object from the desk.
act of God; irresistible force; inevitability · force majeure; vis major
normal force
induced drag
wave-making resistance · wave drag
Compound of 抗 (resist) and 力 (force). The exact historical derivation is uncertain; the spelling is conventionally associated with the physics meanings.