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Material Properties Exploration

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Material Properties Exploration

The skate park needs safer, longer-lasting equipment. Read each clue and use what you know about material properties to help Isla, Jarrah and Hudson choose suitable materials. Answer every question; for questions about tests, use the evidence given.

Read the evidence

The trio tested four materials. They used the same gentle scratch test and bend test each time. In a simple battery-and-bulb circuit, the bulb lit only when the test material completed the circuit.

Material: aluminium strip Scratch: difficult to scratch Bend: bends a little Circuit: bulb lit

Material: rubber wheel Scratch: easy to mark Bend: squashes and returns to shape Circuit: bulb did not light

Material: rigid polymer panel Scratch: difficult to scratch Bend: barely bends Circuit: bulb did not light

Material: copper wire Scratch: difficult to scratch Bend: bends easily Circuit: bulb lit

1.Which two tested materials conducted electricity? Use the circuit evidence.
2.Which tested material was both difficult to scratch and unable to conduct electricity?
  • Aluminium strip
  • Rubber wheel
  • A panel made from a rigid synthetic material
  • Copper wire
3.The rubber wheel squashed and returned to its shape. Which property does this show most clearly?
  • Electrical conductivity
  • Elasticity
  • Transparency
  • Magnetism

Choose materials for the park

Different jobs need different combinations of properties. A material can be useful for one purpose and unsuitable for another.

4.The park needs a protective helmet shell that is hard to scratch and does not conduct electricity. Which tested material is the best match? Explain using two pieces of evidence.
5.A replacement wheel must squash slightly on bumps and return to shape. Which material in the test results matches this requirement, and why?
6.A repair needs a material to carry electricity through a small circuit and bend around a corner. Which tested material is the better choice: aluminium strip or rigid polymer panel? Explain.
7.True or false: A material that is hard is automatically a good electrical conductor. Use one example from the results to support your answer.
TrueFalse
8.Isla suggests making a skateboard truck (the part connecting the board to its wheels) from rubber because rubber is flexible. Give one reason this may be a poor choice for the truck.

Explain and design

Use properties as evidence. More than one answer can work if the reasoning is sound.

9.Jarrah proposes adding a thin layer of rubber to a rigid polymer helmet shell. Explain how the two materials could contribute different useful properties.
10.Design a material test to decide whether a new skate-park handrail coating is slippery when wet. Compare a wet sample with the coating to a wet reference surface. Name what you would change, what you would keep the same and what you would observe or measure. Treat the coating as more slippery if a standard object slides farther on it.
11.Hudson says copper wire must be safe to touch because it bends easily. What is the mistake in his reasoning?

3 printable pages

  • Material Properties Exploration, page 1 of 3: Read the evidence

    Page 1

  • Material Properties Exploration, page 2 of 3: Choose materials for the park

    Page 2

  • Material Properties Exploration, page 3 of 3: Explain and design

    Page 3

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