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Nature of Fluid Friction

Objects moving through a fluid [both liquids and gases] experience fluid friction or drag. The fluid friction acts between the object and the fluid and hinders the motion of the object. The force of fluid friction depends upon the object’s shape, material, and speed, as well as the fluid’s viscosity. Viscosity is a measure of a fluid’s resistance to flow. It results from the friction that occurs between the fluid’s molecules, and it differs depending on the type of fluid.


The drag slows down airplanes flying through the air and fish swimming through water. The bodies of airplanes, birds and fishes are designed in such a way that not much energy is lost in overcoming fluid friction.




Did you know?


Streamlining is the process of shaping a body to reduce fluid friction.

Liquids exerts equal friction compared to air.

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