Hydraulics and Fluid Mechanics in ME
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

Newton's law of cooling
Newton's law of resistance
Newton's law of motion
Newton's law of viscosity

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The velocity of flow is large
The available head of liquid is more than 5 times the height of orifice
The size of orifice is large
The available head of liquid is less than 5 times the height of orifice

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