Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their algebraic sum is zero
Their lines of action are at equal distances

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

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Engineering Mechanics
Which of the following statement is incorrect?

A force acting in the opposite direction to the motion of the body is called force of friction
The velocity ratio of a machine is the ratio of load lifted to the effort applied
A machine whose efficiency is 100% is known as an ideal machine
The ratio of the limiting friction to the normal reaction is called coefficient of friction

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