Strength of Materials
Coulomb friction is the friction between

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

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Strength of Materials
Center of percussion is

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

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Strength of Materials
In ideal machines

mechanical advantage is equal to velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity
mechanical advantage is greater than velocity ratio

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces meet in a point

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