Castle Under Siege!: Simple Machines
Introduces simple machinery devices and explains how they were used in the Middle Ages to build and defend castles. Diagrams illustrate how wedges, a drawbridge, screw, catapult, crowbar and pulley work. Suggested level: primary, intermediate.
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Ages to build Angela archer soldier archer turned attackers could try axle bar back the string bow to fire break the castle Building a Castle called the fulcrum castle walls castle was hard chain to help crane crossbow Crowbars cut stone easier than lifting end and thick end higher enemy castle fire arrows fulcrum fixed point giant catapult heavy load Heinemann Library help lift heavy inclined plane flat knight in history Knights lived lever beam lever moves lift heavy weights Lifting the drawbridge load on wheels Middle Ages moat lake move twice pieces of wood plane flat surface plane is easier pulley small wheel push or pull rope threaded Royston siege towers simple machine tool single point called sling end small wheel threaded stonemason person surrounds an enemy trained to fight treadmill large wheel tunnel turn by walking type of wedge wedge piece wheels and axles wheels joined wood or metal