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phymatter
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is there no stress when a net force is not equal to 0 ,i mean that whenever we talk about stress why is the net force 0 ?
wiki said:According to the principle of conservation of linear momentum, if the continuum body is in static equilibrium it can be demonstrated that the components of the Cauchy stress tensor in every material point in the body satisfy the equilibrium equations (Cauchy's equations of motion for zero acceleration). At the same time, according to the principle of conservation of angular momentum, equilibrium requires that the summation of moments with respect to an arbitrary point is zero, which leads to the conclusion that the stress tensor is symmetric, thus having only six independent stress components, instead of the original nine.
phymatter said:i mean , that the formulas of stress , strain , young 's modulus applicable to a moving body , because in all the definations in all the books i have seen , they have assumed that the body is in complete equlibrium , ie. net force and torque =0.
Excuse me?Andy Resnick said:Equilibrium has nothing to do with stress and strain any more than it does with forces and displacement.
Equilibrium has nothing to do with stress and strain any more than it does with forces and displacement.
Net force is the overall force acting on an object, taking into account the magnitude and direction of all individual forces acting on it.
Net force is calculated by adding together all the individual forces acting on an object, taking into account their magnitude and direction. This can be represented mathematically as ΣF = ma, where ΣF is the net force, m is the mass of the object, and a is the acceleration.
When net force is equal to 0, it means that all the forces acting on an object are balanced and there is no resultant force. This results in the object maintaining a constant velocity or remaining at rest.
No, there can still be stress on an object even when the net force is not equal to 0. This is because stress is not only dependent on the magnitude of the force, but also on the surface area over which the force is applied.
An unbalanced net force will cause an object to accelerate in the direction of the resultant force. This acceleration can either be in the form of a change in speed or direction of motion.