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

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

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Strength of Materials
Coefficient of friction is the

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

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