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Secondary III • 9mo.

What is the difference between a force, a constraint, and the consequences of the effects of a force?

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  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 9mo.

    Thank you for your question!


    A force is an action that can change the shape of a body, modify its movement or cancel its stationary state.

    "There are two kinds of force: Tension and compression:

    • Tension force: "pulls" the body and tends to pull or stretch the objects. For example, stretching a rubber band, stretching a rope, a chain that pulls an object, a bag stretching due to the heavy objects it contains ...

    Compressive force: Force that pushes on objects and tends to compress, push or crush the objects. For example, a person pushing on a block, a structure built on the ground, a person crushing an aluminum can, chewing ...


    Stress is the effect of a force on a body undergoing it. There are 5 types of stresses:

    • Crushing

    • Elongation

    • Torsion

    • Bending

    • Shearing


    These stresses always have consequences on the objects subjected to them. There are three types of consequences of the effects of forces:

    • Elastic deformation (temporary deformation)

    • Plastic deformation (permanent deformation)

    • Rupture (breakage of the object)


    In other words, a force is an action, and stress is the effect of a force.



    Do not hesitate if you have other questions!