Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂) r
(ω₁ - ω₂) 2r
(ω₁ + ω₂) r
ω₁.ω₂.r

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Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane motion which is a resultant of plane translation and rotation
Restrained to rotate while sliding over another body
In plane rotation with variable velocity
In plane translation with variable velocity

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Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

All of the listed here
Reduce maximum opening of port to steam
Reduce length of effective stroke of piston
Cause withdrawing or throttling of steam

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