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Your Name____________________________________________ Period_________ DUE DATE_____________ 7 th GRADE ENGINEERING CHALLENGE A Better Plastic 1

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Your Name____________________________________________Period_________

DUE DATE_____________

7th GRADE ENGINEERING CHALLENGE

A Better Plastic

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The Engineering Design Process

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WELCOME LETTERDear Student Engineers:

The Better Plastics Company has been making plastics for our valued customers for over 50 years. Our facilities are capable of converting petroleum into plastics perfect for a wide variety of products including

Plastic tableware for the company “Fork it Over” Moldable hard plastics for the casing, lids, and erasers for “Pete’s Pens and Pencils“ Thin but inflexible plastics for “Bottle This”, who manufacture plastic bottles for soft drinks

and water Very flexible but still strong plastics for “Cheerful Chips and Crackers” to package their

various crispy snacks.

We have been one of the leading plastics manufacturers for a long time, but recently our marketers have identified a problem. Some of the companies we make plastics for have grown concerned about the plastics we produce. They are worried about the environmental impact of using petroleum products and they are even more concerned about what happens to their products once they are thrown away. It’s true, though we make many different kinds of plastics, all of them take thousands of years (or more!) to break down in the environment.

We don’t want to lose our environmentally conscious customers, but we also want to maintain our reputation for producing high-quality products. We are hoping to create a whole new division of our company that makes the same kinds of plastics from natural sources. Some engineers suggested that we design a biopolymer. Biopolymers are similar to plastics, but are made from natural raw materials so they are less harmful for the environment.

We are turning to you for help and ideas. We want you to engineer a new line of biopolymers that will take our company, and our customers, into a greener future. We will start small, designing a biopolymer that can be used to replace at least one of the plastics we currently manufacture. If you are successful, maybe we can expand from there!

Best of luck!

Sincerely,

The Better Plastics Company

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I. DEFINE THE PROBLEM – Background

Types of Plastics Investigation

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Type of Plastic Properties Used For… Pros and Cons

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I. DEFINE THE PROBLEM (continued)

II. Generating Possible Solutions5

The Problem:

Criteria Constraints

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Plasticizer/Notes

1)

2)

Starches/Notes

1)

2)

3)

4)

Additives/Notes

1)

2)

3)

II. Generating Possible Solutions

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Testing the Sample Plastic:Recipe:

Criteria Measurement Observations

Flexibility

Tensile Strength

Texture

Your Plastic (trial #1) First, explain what type of plastic you are trying to make and why:

_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________

1st Proposed Bioplastic Formula

2 nd Proposed Bioplastic Formula

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Material Quantity Reason

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Making Your PlasticMaterials:Goggles Oven Mitt Bioplastic ingredients Triple Beam Balance or scaleHot plate Beaker Spoon Square petri dishStirring Rod Graduated Cylinder

TIPS: If you are using glycerin or oil, they are too thick to measure with a graduated cylinder; a close approximation is 1 mL=1/2 tsp

Directions:

1) Put your goggles on

2) Follow your proposed formula to mix the contents of your bioplastic in a beaker. Stir until most of the lumps are gone

3) Turn the hot plate on and set the beaker on the hot plate.

4) Stir the mixture continuously as it begins to gel and get sticky. Adjust the temperature of the hot plate as needed so that the mixture does not burn.

5) Continue to heat the mixture until it boils and then continue to heat for one more minute. However, if lumps begin to form, it is overheated.

6) Label a square petri dish with group member names and class period

7) Use the oven mitts to remove the beaker from the hot plate and pour the mixture into a mold of your choice

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Material Quantity Reason

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III. Collect and Display Data

Data: Budget of 1 st Formula

Data: Criteria Measurements and Observations for 1 st Formula Criteria Measurement ObservationsFlexibility

Tensile Strength

Texture

Elongation

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Data: Budget of 2nd Formula

Data: Criteria Measurements and Observations for 2nd FormulaCriteria Measurement ObservationsFlexibility

Tensile Strength

Texture

Elongation

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I. Defining the Problem

Mastery Proficiency Approaching Proficiency Not Proficient

Complete “Proficiency” critiera, and add the following:

*Detail and science vocabulary effectively used in Types of Plastics investigation

*Background in INB has high level of detail/science vocab

*Student may have achieved Mastery on Defining the Problem Quiz

*Complete INB and Proficiency score on Defining the Problem Quiz

*Types of Plastics Investigation is complete

*Problem, criteria and constraints have been included

*Partially complete background in INB

*Types of plastics is partially complete and/or partially accurate

*Problem. criteria, and constraints have been identified

*Incomplete Background Information in INB and/or not proficient score on Defining the Problem Quiz

*Several Cornell Notes parts are missing

*Problem, critieria, contraints may be missing

II. Designing Possible Solutions

Mastery Proficiency Approaching Proficiency Not Proficient

Complete the “Proficiency” criteria, and add the following:

*Notes about available materials are included with strong details

*After all data testing has been done, an additional bioplastic formula is included with a thorough explanation why (this needs to be attached on a separate page)

*Notes about available materials are included with some detail

*Type of plastic being designed is described with an explanation why

*Formula for two bioplastic proposals included with a reason given for each ingredient

*Student is safe and appropriate during all procedures

* Available materials are listed but few details given

*Type of plastic is selected but no explanation given

*Formula for two bioplastic proposals is given with reasons, but some reasons do not match the material

*Student is safe and appropriate during all procedures

*Available materials are either not listed or little/no information is given*Type of plastic is not selected*Only one proposal is given and/or no reasons provided*Student has not demonstrated safe, appropriate behavior and may be completing alternative work

III. Collecting and Displaying Data

Mastery Proficiency Approaching Proficiency Not Proficient

All ‘proficiency’ criteria plus*Data is detailed

*Additional data displays are used to highlight patterns if appropriate (graphs/illustrations/etc)

*Collects data that are consistent with design plan or investigation

*Accurate data is collected in an organized manner

*Data displayed in a manner that communicates results in an organized format. *Appropriate units and labels are used.

*Data is complete and consistent with design plan or investigation.

*Accurate data is collected

*Data displayed in a manner that may be unorganized or difficult to understand. *Some units and labels may be missing.

*Data may be incomplete, inaccurate, or not part of the design plan.

*Data is highly unorganized.

*No units or labels included.

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IV. Evaluating Design Solutions

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Mastery Proficiency Approaching Proficiency

Not Proficient

Complete all “Proficiency” criteria and add the following

*All criteria and constraints are used as evidence to support the claim

*Sources and specific values for each piece of evidence are identified

*Compares more than one sample as an opposing argument

*Suggested improvements are explained in detail with justification for why

*student clearly explains which design was most successful

*Most of the criteria and constraints are used as evidence to support the claim

*Specific values are given for most evidence *Uses adequate important vocabulary and/or concepts in the correct context

*Suggests improvements which are reasonable

*Student may have only partially identified the most successful design

*Evidence is used to support the claim but it may not be sufficient or relevant

*Shows basic understanding of the concept with vocabulary words or concepts are used

*Student’s choice for most successful design is unclear.

*Little or no evidence is included

*Little or no understanding is demonstrated

*Few vocabulary words or concepts are used