Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Downwards at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end

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

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

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

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