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

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

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Strength of Materials
Center of percussion is

point of suspension
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 metacentre
the point of C.G.

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Strength of Materials
In ideal machines

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

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Strength of Materials
In actual machines

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

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