Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

constitute a moment
constitute a couple
balance each other
constitute a moment of couple

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

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Strength of Materials
Kinetic friction is the

Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
The friction force acting when the body is in motion
Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move

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