Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

None of these
Newton's first law of motion
Newton's third law of motion
Newton's second law of motion

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

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Engineering Mechanics
The static friction

Bears a constant ratio to the normal reaction between the two surfaces
All of these
Always acts in a direction, opposite to that in which the body tends to move
Is independent of the area of contact, between the two surfaces

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