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
vertically
along the plane

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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
Ratio of limiting friction and normal reaction
the friction force acting when the body is in motion
The friction force acting when the body is just about to move

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Strength of Materials
In actual machines

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

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