Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Principle of conservation of energy
Newton's first law of motion
Principle of conservation of momentum
Newton's second law of motion

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane

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Engineering Mechanics
The moment of a force

All of these
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
Is the turning effect produced by a force, on the body, on which it acts

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Engineering Mechanics
According to Newton's first law of motion,

To every action, there is always an equal and opposite reaction
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
None of these
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force

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