Friction force from normal force
================================

The *friction* force is tangential interaction between two objects, which impedes their relative movement.
It is proportional to the normal force between the two objects.

**Links**

#. `Physics LibreTexts <https://phys.libretexts.org/Courses/Tuskegee_University/Algebra_Based_Physics_I/04%3A_Dynamics-_Force_and_Newton%27s_Laws_of_Motion/4.07%3A_Friction>`__.

.. py:currentmodule:: symplyphysics.laws.dynamics.friction_force_from_normal_force

.. py:data:: friction_force

    The friction :attr:`~symplyphysics.symbols.classical_mechanics.force`.

Symbol:
    :code:`F_fr`

Latex:
    :math:`F_\text{fr}`

Dimension:
    :code:`force`


.. py:data:: friction_coefficient

    The :attr:`~symplyphysics.symbols.classical_mechanics.friction_coefficient` between the two objects.

Symbol:
    :code:`mu`

Latex:
    :math:`\mu`

Dimension:
    :code:`dimensionless`


.. py:data:: normal_force

    The normal reaction :attr:`~symplyphysics.symbols.classical_mechanics.force` from one object to another.

Symbol:
    :code:`N`

Latex:
    :math:`N`

Dimension:
    :code:`force`


.. py:data:: law

    :code:`F_fr = mu * N`

    Latex:
        .. math::
            F_\text{fr} = \mu N