Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">

Wtan(a + <)>)
Wcos(a + )
Wsin(a + <(>)
Wtan(a-<)>)

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Strength of Materials
Center of percussion is

the point of metacentre
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension
the point of C.G.

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