The weight of a body is due to____________________?

A. centripetal force of earth
B. gravitational pull exerted by the earth
C. forces experienced by body in atmos-phere
D. force of attraction experienced by par-ticles
E. gravitational force of attraction towards the centre of the earth

According to principle of moments_________________?

A. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
B. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
D. positive and negative couples can be balanced
E. none of the above

According to Lami’s theorem________________?

A. three forces acting at a point will be in equilibrium
B. three forces acting at a point can be represented by a triangle, each side being proportional to force
C. 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
D. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
E. none of the above

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