Daniel Bernoulli, with Johann ( Jean ) Bernoulli ( 1667 1748 ), is also credited with formulating the theory of virtual work, providing a tool using equilibrium of forces and compatibility of geometry to solve structural problems.
12.
And when A body s action force interacts with B body s action force, the equilibrium of forces between A & B are lost in case of ( the initial ) unbalanced momentums of the both bodies.
13.
From equilibrium of forces on the infinitesimal element, the magnitudes of the normal stress \ sigma _ \ mathrm { n } and the shear stress \ tau _ \ mathrm { n } are given by:
14.
Both equations can also be obtained by applying the tensor transformation law on the known Cauchy stress tensor, which is equivalent to performing the static equilibrium of forces in the direction of \ sigma _ \ mathrm { n } and \ tau _ \ mathrm { n }.
15.
To me Weightlessness of an object [ Zero gravity ] is only possible if placed at the center and equidistance from the gravitating masses [ equilibrium of forces ] OR accelerating exactly at the same rate g of the gravitating mass but in opposite direction and in all other cases itt is under the influence of g or gravity force.
