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Engineering & design

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Sample exercises

Grades 5–10 · Design & testing

Which is a design constraint?

  1. The designer hopes it looks attractive.
  2. The title is interesting.
  3. The model must fit inside a 20 cm box.
Answer and explanation

The model must fit inside a 20 cm box.

A constraint limits allowable solutions.

Grades 5–10 · Design & testing

Which is a performance criterion?

  1. Hold a specified model load without collapsing.
  2. An unrelated song.
  3. The designer's birthday.
Answer and explanation

Hold a specified model load without collapsing.

A criterion describes how well the solution should function.

Grades 5–10 · Design & testing

A model uses pieces costing 12, 8 and 15 units. Find total stated cost.

Answer and explanation

35

12 + 8 + 15 = 35.

Grades 5–10 · Design & testing

Why should the intended users be included in the brief?

Answer and explanation

Their tasks, abilities and context affect requirements.

Design should solve a defined user problem.

Grades 5–10 · Design & testing

What should follow a failed prototype test?

  1. Analyze the failure and revise relevant features.
  2. Assume all future designs fail.
  3. Hide the result.
Answer and explanation

Analyze the failure and revise relevant features.

Failure data can guide improvement.

Grades 5–10 · Design & testing

A design must weigh at most 200 g and currently weighs 235 g. What minimum mass must be removed?

Answer and explanation

35 g

235 − 200 = 35 g.

Study notes

Linear thermal expansion

Assume a constant expansion coefficient and small strain over the temperature range.

Grades 9–12