code: def test_clear_load():
      a = symbols("a")
      P = Point("P")
      B = Body("B")
      force = a * B.z
      B.apply_force(force, P)
      assert B.loads == [(P, force)]
      B.clear_loads()
      assert B.loads == []
  
imports: from sympy import Symbol, symbols, sin, cos, Matrix, zeros, simplify
  from sympy.physics.vector import Point, ReferenceFrame, dynamicsymbols, Dyadic
  from sympy.physics.mechanics import inertia, Body
  from sympy.testing.pytest import raises
label_desc: Use image node_id 14 for calling a global function with example usage: test_clear_load() without return types