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Strength of Materials

Strength of Materials
The unit of work or energy in S.I. units is

joule
watt
pascal
newton

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Strength of Materials
When trying to turn a key into a lock, following is applied

couple
coplanar force
moment
non-coplanar forces

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Strength of Materials
The product of either force of couple with the arm of the couple is called

moment of the forces
moment of the couple
resulting couple
resultant couple

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Strength of Materials
The coefficient of friction depends on

shape of surfaces
area of contact
strength of surfaces
nature of surface

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

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

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Strength of Materials
Two coplanar couples having equal and opposite moments

Produce a moment of couple
Produce a couple and an unbalanced force
Are equivalent
Balance each other

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