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???

PLANNINGPLANNING. .

What is displacement???What is displacement???

• PoolsPools

• BathtubsBathtubs

• Kitchen SinksKitchen Sinks

• Turkey FryersTurkey Fryers

First, sketch your vessel. First, sketch your vessel. (KISS)(KISS)

Dimension you vesselDimension you vesselLength – Width – HeightLength – Width – Height

2”

4”

3”

Determine Volume of Barge Determine Volume of Barge

2”

4”

3”

Length x Width x Height =

24 cu in

How many inches are there in How many inches are there in a cubic foot?a cubic foot?

1728

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”

The weight of WaterThe weight of Water

64 pounds per cubic foot

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

Determine the mass of the Determine the mass of the bargebarge

Aprox. 100 grams

How many grams are in a How many grams are in a pound?pound?

1 pound = 453.6 grams

Convert grams to poundsConvert grams to pounds

100 / 453.6

.22 pounds

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

What is the mass of a What is the mass of a penny?penny?

2.78 grams

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