Newton's third law: When two particles interact, the force
F which the first exerts on the second, is equal and opposite to the
force F that the second exerts on the first, both being on the straight
line that joins the particles. The process is simultaneous.
The following image represents the interaction of two bodies, 1 and 2
which repel each other.
We write F1/2
to indicate the force that body 1 exerts on body 2 and F 2/1 to indicate the force which
body 2 exerts on 1.
They are equal and opposite. They are applied on different bodies (if
they applied to the same body they would cancel each other out).
![interacción](https://www.juntadeandalucia.es/averroes/centros-tic/29009260/helvia/aula/archivos/repositorio/0/51/html/english/4eso/dinamics/images/f12.gif)
The
forces exist while the interaction lasts. You can revise
interactions here.
The following visual represents the
interaction between two skaters. It represents the corresponding pair
of forces.
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