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NEETPhysicshard
When I half-cover a tap or hose with my thumb, why does the water suddenly spray out much faster?
This is the equation of continuity, A1v1 = A2v2.
Mechanical Properties of FluidsRead →
NEETPhysicshard
Why does the roof of a house sometimes get lifted off during a storm even though the wind blows sideways, not up?
Fast-moving air over the roof lowers the pressure there (Bernoulli's principle: faster flow → lower pressure).
Mechanical Properties of FluidsRead →
NEETPhysicshard
A steel ship floats but a steel needle sinks — both are steel, so how?
Floating depends on average density, not the material alone.
Mechanical Properties of FluidsRead →
NEETPhysicshard
How does a small hydraulic jack let one person lift a whole car?
By Pascal's law, pressure applied to an enclosed fluid is transmitted equally everywhere.
Mechanical Properties of FluidsRead →
NEETPhysicshard
Why does a raindrop or a skydiver stop speeding up and fall at a steady 'terminal' velocity?
As the drop speeds up, the upward viscous drag of the air (which grows with speed) and buoyancy increase until they exactly balance gravity.
Mechanical Properties of FluidsRead →
NEETPhysicshard
Why does water climb up a thin glass tube on its own, while mercury actually goes down?
It's capillarity, set by whether the liquid wets the glass.
Mechanical Properties of FluidsRead →