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what is the difference of torque and torsion
in Strength of Materials by  

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----->Torque is a measureable concept, whereas torsion is a concept, which is mathematically projected by the shear stress or the twist angle.

-----> Torque requires at least one force and torsion requires at least two forces to happen.

-----> Torque depends only on the magnitude, directions and the separation of the forces applied, while torsion depends on the torque, the type of material and the shape of the object.