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

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Same at every point on its line of action
Different at different points on its line of action
Minimum, if it acts at the center of gravity of the body
Maximum, if it acts at the center of gravity of the body

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