Machine Design
For high speed engines, the cam follower should move with

Uniform acceleration and retardation
Simple harmonic motion
Cycloidal motion
Uniform velocity

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

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