Castle Under Siege!: Simple Machines
Blackout! Castle Under Siege! Wackiest Machines Ever! These books take an exciting new approach to physical science curriculum topics, including materials and their properties, simple machines, energy, forces and motion, electricity, sound and light, and gravity. Raintree Fusion is high-interest nonfiction aligned with curriculum, at a reading level accessible to struggling readers.
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Ages to build 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 downward push end and thick end higher enemy castle fire arrows fulcrum fixed point giant catapult heavy load 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 protect castles pulley small wheel push or pull rope threaded 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 wheel or wheels wheels and axles wheels joined wood or metal