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Viscous Drag

Viscous drag is the frictional force between a solid and a fluid.For fast and irregular objects calculation is difficult because of turbulent flow.You can plot a graph of flow rate against height.Poiseuille's formula tells us the gradient of the graph is
gradient = π ρ g r4
8 η l

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Specification: Edexcel Physics (8PH0), AS-level, Topic 4: Materials, statement 51. Topic: Fluids.

Key terms in this lesson

turbulent flow
Chaotic, swirling fluid flow in which the velocity at a fixed point changes unpredictably over time.

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