Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Coplanar concurrent forces
Like parallel forces
Unlike parallel forces
Coplanar non-concurrent forces

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

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