Strength of Materials
A single force and a couple acting in the same plane upon a rigid body

balance each other
are equivalent
cannot balance each other
produce moment of a couple

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Strength of Materials
Center of percussion is

the point of metacentre
the point of C.G.
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension

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Strength of Materials
Limiting force of friction is the

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

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

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