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

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

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Strength of Materials
The weight of a body is due to

centripetal force of earth
gravitational force of attraction towards the centre of the earth.
gravitational pull exerted by the earth
force of attraction experienced by par-ticles

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