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1
Density Divers Paul Schember Norwood Middle
School

• Project Questions
• Essential Question
• How can we make an object with a variable
  density to meet the project criteria?
• Sample Guiding Questions
• -What materials should we use?
• - How can we remotely change the subs
  density?
• - How do we maintain the various densities
  in our sub?
• - How do we equip the sub to pick up the
  cargo?
• - How can we maneuver the sub?
• Engineering Teamwork
• A real-life solution to this problem would
  require the work of several types of engineers
  Marine, Mechanical, Electrical, Nuclear,
  Military, Systems, Environmental, and naval
  architecture.

• The Challenge
• Work with a fellow engineer to design and build
  a model submarine that meets these criteria
• Rise and sink due to density changes
• Float for 10 seconds
• Stay at bottom for 10 seconds
• Hover at targeted depth for 5 seconds
• Rescue and lift a sunken cargo up to the surface
• Global Relevance
• Submarines have been engineered to perform
  many important tasks for us

• How it works
• Subs will be built with 2-liter bottles
• A filled 75-gallon aquarium will be used for the
  ocean
• The sunken cargo will be magnetized
• Students will work in pairs
• A variety of materials will be offered, but
  students may suggest others for their designs

• Activities along the way
• Access prior submarine knowledge
• Develop the essential and guiding questions
• Density Lab
• Internet research learn about actual submarine
  functions and find applicable ideas
• Assemble and observe Cartesian divers buoyancy
  and variable density
• Brainstorming and planning how will we make it
  work?
• Build and test the model
• Make changes and submit for final launches

CEEMS is supported by the National Science
Foundation grant 1102990. Any opinions,
findings, conclusions, and/or recommendations are
those of the investigators and do not necessarily
reflect the views of the Foundation.