Teaching article
How much does the paper container hold under this test?
Define the model's intended contents before comparing designs.
Specify the intended contents before filling the prototypes. Six identical paper cubes provide a comparable load, while switching between cubes and loose scraps changes the meaning of the capacity being recorded.
To hand: Paper containers and large paper cubes.
Define usable contents and placement before filling. A count is comparable only when each model receives the same kind of load.
Keep the contents and placement consistent
Specify the contents. Fill consistently. Record usable amounts.
A container holding six identical cubes meets a different target from one holding loose scraps.
Were the contents comparable? Use pre-counted cubes.
Avoid wet or food loads.
Define what “holds” means for this task
Give the fictional container one intended job: store a set of identical lightweight paper cubes without crushing them and remain within a marked tabletop footprint. The cubes are the specified contents, so switching to tiny scraps would answer a different question. Use large safe components and keep the test dry.
Agree whether the lid must close, whether contents may rise above the rim and how cubes will be arranged. A count of six can mean different things if one group stacks neatly while another leaves large gaps. The placement rule does not need to be perfect, but it must be stated and applied consistently.
Record usable performance as well as a count
Add cubes gently, checking whether the base bows, the sides open or the opening becomes difficult to use. Stop at the agreed safe limit or when the model no longer meets the brief. A container that can momentarily surround eight cubes but cannot be closed may have a different usable capacity from one that stores six as intended.
Use a simple record containing cube count, arrangement and observed condition. The numerical count is not automatically a standard volume measurement unless the task specifies the cube dimensions and relevant packing assumptions. For an introductory comparison, “number of these cubes stored under this rule” is accurate and sufficient.
Ask whether both containers were tested with the same cubes and placement sequence. Different dimensions, flexible sides or damaged corners may affect the result. If the procedure changes, note it. The purpose is to understand usable capacity for the stated contents rather than produce the largest possible number by compressing the load.
Offer pre-counted cubes, prepared containers and a partner who places the contents. Children can check the closure criterion or compare result photographs. End with a recommendation tied to the fictional storage job and one limitation. The account should distinguish space that exists in the model from space that can actually be used in the intended way.
Resources
- Doughnut Shop Paper Stand STEM — Use the lightweight display-stand brief to test fit and stability.
Further reading
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