A screw jack is a simple machine having combination of _______ and ________
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A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderately and heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.[citation needed]
A 2.5-ton screw jack. The jack is operated by inserting the bar (visible lower left) in the holes at the top and turning.
A leadscrew operates this automotive scissor jack.
Antique locomotive screw jack
Antique wooden jackscrew for repair of cart and wagon wheels (Ethnographic Museum of Elhovo, Bulgaria)
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