Definition - lever: A rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other. The ways in which one can use mechanical advantage in the form of a lever are near infinite.. from the simplicity of a hammer pulling a nail, to the immense force created by a well placed Birk bar, there’s simply no great knowledge in the field of construction that will aid in making hard, heavy and dangerous tasks easy and safe. Never stop expand

11K views · 143 reactions | Lever Systems in Our Body Explained in...