Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Varies linearly
Varies exponentially, being less at the torque-input end
Is uniform throughout
Varies exponentially, being more at the torque-input end

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Machine Design
In a hydrodynamic lubricated bearing

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

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