penny barge design mr. parrott newton falls high school technology education
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Penny Barge Penny Barge DesignDesign
Mr. ParrottMr. Parrott
Newton Falls High SchoolNewton Falls High School
Technology EducationTechnology Education
The Problem:The Problem:
Design and build a floating structure to be tested in class to hold as many pennies as possible before capsizing or sinking.
Specifications:Specifications:
• Structure may only consist of cardboard Structure may only consist of cardboard and glue/tape provided in lab.and glue/tape provided in lab.
• Material may not exceed 12” x 12” surface Material may not exceed 12” x 12” surface area.area.
• Structure may be waterproofed with latex Structure may be waterproofed with latex paint.paint.
• Structure must floatStructure must float
• Structure may not touch the tank when Structure may not touch the tank when tested. tested.
How will we know we have How will we know we have built the craft to hold the built the craft to hold the maximum amount of maximum amount of pennies???pennies???
What is displacement???What is displacement???
• PoolsPools
• BathtubsBathtubs
• Kitchen SinksKitchen Sinks
• Turkey FryersTurkey Fryers
Divide Barge Volume by the # Divide Barge Volume by the # of cubic inches in a cubic foot.of cubic inches in a cubic foot.
24cu” / 1728 =
.013 cubic feet2”
4”
3”
Multiply the Cu.Ft. of the barge x Multiply the Cu.Ft. of the barge x the weight of water per cubic foot the weight of water per cubic foot to determine pounds of water to determine pounds of water displaced by the barge.displaced by the barge.
.013 x 64 =
.832 pounds displaced
Subtract weight of barge from Subtract weight of barge from weight of displaced water to find weight of displaced water to find penny load.penny load.
.832 - .22
.612 pounds of pennies
Convert penny load lbs into Convert penny load lbs into mass:mass:
.612 x 453.6
277 grams of pennies
Divide allowable penny mass by the Divide allowable penny mass by the mass of one penny to determine the mass of one penny to determine the number of pennies the barge can hold.number of pennies the barge can hold.
277 / 2.78 =
99 pennies***Theoretically***
Why could this number be Why could this number be less?less?
• WorkmanshipWorkmanship
• LoadingLoading
• Other variablesOther variables
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