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The Science of boat design: Floating and Sinking

The Science of boat design: Floating and Sinking. List some applications in technology that are related to floating and sinking…. Why is ‘floating’ and ‘sinking’ important?. What causes something to float?. Archimedes Principle.

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The Science of boat design: Floating and Sinking

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  1. The Science of boat design: Floating and Sinking

  2. List some applications in technology that are related to floating and sinking…

  3. Why is ‘floating’ and ‘sinking’ important?

  4. What causes something to float? • Archimedes Principle Buoyant force (upward force) is equal to the weight of the fluid displaced by the object. Born about 287 BC

  5. What!?!?!?!? • A canoe made out of concrete – how is that possible?

  6. Wait! Many boats are made of steel and float BUT HOW?

  7. Well, it has to do with the material they are made of… • Different materials have different densities. For example: • Water = 1 g/cm3 • Air = less than 1 g/cm3 • Glass = 2.5 g/cm3 • Aluminum = 2.7 g/cm3 • Steel = 7.0 g/cm3 • Concrete = varies (based on mixture) BUT THAT’S NOT ALL!

  8. Coke and Diet coke • What will happen when the two cans are placed in the tank of water?

  9. What other factors play a role? Solid Concrete Block Concrete Canoe Solid Steel Block Boat made of steel

  10. Size and SHAPE Play a role too • You can shape a boat in such a way that the weight of the boat has been displaced before the boat is completely underwater by making it bigger (increasing the volume). • Also, if air is trapped inside, that helps it float too! Try and figure out what shape boat is the best for holding the most mass.

  11. Build your own boat! • You will use: • Aluminum foil (12” x 6”) – 3 pieces (2 practice and 1 final) • Tape • Scissors • The goal is to build a boat with the greatest buoyant force possible. The boats will be tested by floating the boat and adding mass; the boat that supports the greatest payload wins.

  12. Who cares? Why is this important?

  13. In conclusion • Successful Tinfoil Boat Builders… • Maximized the volume of her boat with the surface area of tinfoil she was allowed to use. A sphere has the largest volume for the smallest surface area, so the boat was most likely somewhat sphere-like. • Why aren’t real boats sphere-like? They need to be able to cut through the water without creating too much friction.

  14. http://www.youtube.com/watch?v=_E83LTTeP3w&feature=related

  15. Careers • Up and coming careers in the STEM fields… View more at http://www.uri.edu/smile/resources.html

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