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Hitler's Lost Sub
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Viewing Ideas
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Before Watching
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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.
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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
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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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