Screw jack

Screw jack Points : Screw jack, Definition, Construction, Working, Mechanical Advantage Definition Screw jack is a simple machine generally used to lift automobiles. Construction • A long screw rod passing through a threaded block ‘B’, having pitch ‘h’.
• A handle ‘H’ to turn the threaded block. Working When an effort ‘P’ applied on the handle ‘H of radius ‘d, the handle moves in a circle. When effort completes one revolution it covers a distance equal to 2p d and load is raised to a height ‘h’. Mechanical Advantage Output = Input
Wh = Px 2πd
W/P = 2π d/h
M.A. = 2π d/h
Mechanical Advantage = Distance through which the effort is moved/Height through which the load is raised