Strength of Materials
In the lever of third order, load W, effort P and fulcrum F are oriented as follows

P between W and F
W, P and F all on one side
F between W and P
W between P and F

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Strength of Materials
Coefficient of friction is the

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

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Strength of Materials
In ideal machines

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

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