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Hitler's Lost Sub
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Viewing Ideas
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Before Watching
To get students thinking about buoyancy, ask them this: Boats are made out of iron and steel, which are denser than water. Why don't they sink? To investigate buoyancy with students, bring in tub toys and have students push them under the water. Which ones sink and which ones float? Why? As they watch, have students record how German engineers designed U-boats to both maneuver and maintain position underwater. To demonstrate buoyant force, use a cork or inflated balloon and have students push it down into a tub of water. As students push down, they are feeling the buoyant force exerted on the object by the water.
After Watching
Submarine captains know that cold seawater is denser than warm seawater so the cold seawater sinks. Have students discuss the adjustments a submarine captain would order on a submarine during an underwater voyage from Florida, northward to under the polar ice cap, and then south to Hawaii.
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