Strength of Materials
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

at an angle equal to the angle of friction to the inclined plane
vertically
horizontally
along the plane

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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
point of suspension
the point of metacentre
the point of C.G.

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