model carga "Força gravitacional constante"
  parameter Real to = 0.0;
  parameter Real Fo = 2.0;
  junta b;
  Real F;
equation
  F = if time >= to then Fo else 0.0;
  b.f = F;
  annotation(Diagram(coordinateSystem(extent = {{-148.5, -105}, {148.5, 105}}, preserveAspectRatio = true, initialScale = 0.1, grid = {5, 5})));
end carga;