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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Strength of Materials
According to Lami's theorem

If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
Three forces acting at a point can be represented by a triangle, each side being proportional to force
Three forces acting at a point will be in equilibrium
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

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Strength of Materials
The weight of a body is due to

gravitational pull exerted by the earth
gravitational force of attraction towards the centre of the earth.
centripetal force of 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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