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Material Strength Investigation Challenge

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Material Strength Investigation Challenge

A walking track crosses a small creek. Your engineering team must compare materials and recommend one for a model footbridge. Use the investigation notes and data below. In a real experiment, wear safety glasses, use small loads, and keep hands clear of falling weights.

Plan a fair test

The team tests strips by laying each across the same two supports and adding identical small masses until the strip bends too far or breaks. The mass at failure is recorded.

1.Which property is being investigated when you find the greatest load a strip can support before failing?

Strength under a load
Transparency
Electrical conductivity
Magnetism

2.Name two features of the test that should be kept the same for every material so the comparison is fair.

3.The team uses three strips cut to the same size, but tests one with the supports 10 cm apart and another with the supports 20 cm apart. Explain why this makes the comparison unfair.

Read the results

Each material was tested three times using identical strips and the same setup. The recorded load is the mass added when the strip first failed.

Material

Test 1

Test 2

Test 3

Cardboard

120

140

130

Plastic sheet

180

170

190

Thin wood

210

200

220

4.Calculate the mean mass at failure for cardboard. Show your calculation.

5.Which material had the greatest mean mass at failure? Calculate its mean to support your answer.

6.True or false: The plastic sheet was stronger than cardboard in every trial. Use one result from the table as evidence.

TrueFalse

7.The three wood results are close together. What does this suggest about the repeatability of the measurements?

Improve and apply

A result is more useful when the method is controlled, repeated, and measured carefully. Engineers also consider how a material behaves in the conditions where it will be used.

8.A team tests one strip of each material and gets surprising results. Suggest one improvement that would make its evidence more reliable, and explain why.

9.The bridge will be outdoors in rain and strong sun. Give one reason the material with the highest test result might not automatically be the best choice for the finished bridge.

10.Write a short recommendation for the model bridge: name the material you would choose based on the results, cite its mean mass at failure, and describe one limitation of the investigation.