Strength of Materials
Which of the following is the example of lever of first order?

All of the listed here
Pair of scissors
Pair of clinical tongs
Arm of man

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Strength of Materials
According to principle of moments

positive and negative couples can be balanced
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

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