Reaction force equals action force
==================================

Newton's third law of motion states that for every action there is an equal and opposite reaction.
Namely, if two bodies exert forces on each other, these forces have the same magnitude but opposite
directions.

**Links:**

#. `Physics LibreTexts, green box <https://phys.libretexts.org/Workbench/PH_245_Textbook_V2/05%3A_Newton's_Laws_of_Motion/5.06%3A_Newtons_Third_Law>`__.

.. py:currentmodule:: symplyphysics.laws.dynamics.reaction_force_from_action_force

.. py:data:: action_force

    The projection of the :attr:`~symplyphysics.symbols.classical_mechanics.force` that the first body exerts on the second body.

Symbol:
    :code:`F_12`

Latex:
    :math:`F_{12}`

Dimension:
    :code:`force`


.. py:data:: reaction_force

    The projection of the :attr:`~symplyphysics.symbols.classical_mechanics.force` that the second body exerts on the first body.

Symbol:
    :code:`F_21`

Latex:
    :math:`F_{21}`

Dimension:
    :code:`force`


.. py:data:: law

    :code:`F_12 = -1 * F_21`

    Latex:
        .. math::
            F_{12} = - F_{21}