In this PR <https://github.com/sympy/sympy/pull/11374> Sampad Saha
mentioned to check if the beam bending works with units or not.
Currently it doesn't work and I think it requires some changes in the units
module as well as in continuum_mechanics package.
For the code snippet
from sympy import *
from sympy.physics.units import meter, kilogram, newton, second, kilo
from sympy.physics.continuum_mechanics.beam import Beam
E, I = symbols('E, I')
R1, R2 = symbols('R1, R2')
b = Beam(3*meter, E*newton/meter**2, I*meter**4)
b.apply_load(-8*kilo*newton, 0, -1)
b.apply_load(R1*kilo*newton, 1, -1)
b.apply_load(R2*kilo*newton, 3, -1)
b.apply_load(12*kilo*newton, 3, -2)
b.bc_deflection = [(1, 0), (3, 0)]
b.solve_for_reaction_loads(R1, R2)
print(b.reaction_loads)
It currently gives ValueError
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