Archimedes Principle

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Archimedes Principle

• Final Exam Cardboard Regatta Boat Race

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Archimedes Principle

• Archimedes' principle is named after Archimedes
  of Syracuse, who first discovered this law in 212
  B.C
• An object partially or wholly immersed in a
  liquid is buoyed up by a force equal to the
  weight of the liquid displaced by the object
• Any fluid applied a buoyant force to an object
  this is partially or completely immersed in it
  the magnitude of the buoyant force equals the
  weight of the fluid that the object displaces

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Archimedes Principle
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Archimedes Principle - Why ships float!!
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Archimedes Principle

• Buoyancy
• The upward force
• is acting on an
• object due to the
• displaced fluid

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Archimedes Principle - Buoyancy

• How can this Principle be applied to creating
  and solving the Cardboard Regatta Boat Challenge?

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Videos

• http//science.howstuffworks.com/6540-mythbusters-
  lets-talk-buoyancy-video.htm
• http//www.youtube.com/watch?v-U1YVZMifMM

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Types of Boat Hulls
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Types Of Boat Hulls (Flat, Round, Multi, Vee)

                            

                            

                            

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Some Terms Associated with Ship Floatation

• Here are some of the important terms associated
  with ship floatation and an accompanying diagram
  to clarify the same.
• Draft this refers to the depth from the water
  surface till the bottom-most section of the ship
  immersed in water
• Freeboard this refers to the remaining height
  of the ship above the water level
• TPC Tonnes per centimeter refers to the amount
  of mass which must be added or removed from a
  ship so that its draft changes by one centimeter.
  
• WPA Water plane area of a ship is the area of
  the ship which the ship occupies when immersed in
  water at the water plane
• Reserve Buoyancy a ship is meant to load cargo
  hence when the ship is empty it must have ample
  space to take additional weights of cargo etc
  without sinking and this is known as reserve
  buoyancy which is defined as percentage of total
  volume
• Read more http//www.brighthub.com/engineering/m
  arine/articles/19774.aspxixzz1JocdzRNa

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PAPER BOAT BUOYANCY CHALLENGE

• PROBLEM
• Design a paper cardstock boat that will float in
  the water with the following criteria
• The boat must be 4 wide and 8 long and 3 deep
  (side of the boat) are the dimensions
• The boat must be designed to have buoyancy in
  water for the longest period of time while
  holding 12 weights (10 washers and 2 nuts) in
  addition to the boat materials
• Once the boat sinks ( this is any portion of the
  boat travelling below the waters line/surface)
  the time stops.
• You will place the weights in the boat and then
  put the boat into the tub of water for testing
• TIME
• You will have two class periods to design this
  boat and test it due by the end of next class
  Friday(testing will take place the last 20
  minutes of the class)
• PEOPLE
• You will work in groups of 2 the group of three
  will produce two boats of which one will be
  tested.

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PAPER BOAT BUOYANCY CHALLENGE cont.

• Materials
• sheet of cardstock supplied
• scissors, x-acto knife kit. Pencil or pen to mark
  measurements only
• 12 of supplied tape
• Ruler - for measuring only not to be used in the
  boat materials
• GRADING
• Two Grades
• First
• 15 seconds is the minimum passing time 100A
• For every second less than this required
  minimum time you will lose 5 pts.
• (3 seconds/12 seconds 85 B lose 15 points)
• Second
• The overall time graduated scale based upon
  the times.
• Greatest time 100A , second 96 A, ..
• It will count as a project grade of 50

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• Q A??