Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thick film of lubricant between the journal and the bearing

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy

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