Let us consider a body subject to two opposing forces
1. If the two forces are equal the net force is zero. But the condition
of the body is not the same as that of body on which no forces at all
are acting.
The body will be strained.
2 If the forces are not equal there will be a net unbalanced force
and there will be acceleration. But the condition of the body is not the
same as that of the body under the action of a single force of the same
magnitude. The strains in both the cases will be different.
It is incomprehensible to me why we object to the cause effect relation
between force and acceleration when we have no objection to the cause
and effect relationship between force and strain.
Or do we deny the cause and effect relationship between force and strain?