Machine Design
In levers, leverage is the ratio of

Effort arm to the load arm
Load arm to the effort arm
Load lifted to the effort applied
Mechanical advantage to the velocity ratio

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Machine Design
Machine screws are

Used to prevent relative motion between two parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Slotted for a screw driver and generally used with a nut

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