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 metacentre
the point of C.G.
point of suspension

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Strength of Materials
In ideal machines

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

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Strength of Materials
Limiting force of friction is the

Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
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

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