Strength of Materials
Coulomb friction is the friction between

solids and liquids
two dry surfaces
bodies having relative motion
two lubricated surfaces

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
The same at every point in its line of action
Minimum when it acts at the C.G. of the body
Different at different points in its line of action

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