Strength of Materials
The weight of a body is due to

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

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces meet in a point
the lines of action of these forces are parallel
these forces are equal

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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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