Strength of Materials
In actual machines

mechanical advantage is equal to velocity ratio
mechanical advantage is unity
mechanical advantage is greater than velocity ratio
mechanical advantage is less than velocity ratio

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Strength of Materials
Kinetic friction is the

The friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is in motion

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