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Grade 4 · lesson 1 of 4

Define a load problem

Define a load problem using supplied evidence and a solved model.

About 18 minutes, plus any extended practice

Download the grade pack

Supplied materials

  • All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
  • Paper, drawing space or a browser document.
  • Reference card A: weight supported in the model. Reference card B: distance between supports.
  • Assessment case 1: Which scientific label fits the specifically described step or feature? Supplied case: Counters placed on bridge.
  • Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Gap between bridge ends.
  • Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Upright holding the beam.
  • Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Bridge folds during the supplied trial.
  • Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: More counters increase model burden.
  • Assessment case 6: Which scientific label fits the specifically described step or feature? Supplied case: Longer gap increases the span.

Learn the idea

A load is the force a structure must support. Our supplied model records use identical counters as a relative load measure. The results are not engineering certification for real structures.

Load means weight supported in the model. Span means distance between supports. Support means part carrying the structure. Failure means stated performance goal is missed.

For load, look for the clue “weight supported in the model.” For span, look for “distance between supports.” More than one process can happen in a real situation. Answer about the one described in this question.

  1. Read or listen to the four science words and what each means. Say how the first two differ.
  2. Choose two of the short cases. Point to the clue that helps you choose a science word for each one. You may draw or say your answer.
  3. Answer each practice question. Say which clue helped you, then check the explanation.
  4. Use the extra task to make two examples that show different science words. Draw or say what makes each one fit.
Worked example

See the method in action

Worked reference-card problem: a card states “weight supported in the model”; a second states “distance between supports.” The first fits load and the second fits span. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case.

Your turn

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Helpful tips
  • Use the feature “weight supported in the model” to justify load; do not sort by the name alone.
  • Distinguish span (distance between supports) from a different process occurring in the same situation.
Which scientific label fits the specifically described step or feature? Supplied case: Counters placed on bridge.

Feedback appears here after you check. This is practice, not a graded school assessment.

See the answer and explanation

load

The answer is load. In the notes, it means “weight supported in the model.” A load is the force a structure must support. Our supplied model records use identical counters as a relative load measure. The results are not engineering certification for real structures.

Take it further

Create one new case showing load and one showing span. Expected: the first explicitly shows “weight supported in the model”; the second explicitly shows “distance between supports.” Explain the distinction by drawing, speaking or writing. A label without a matching feature is incomplete.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.

More practice: try new cases

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

More practice: try new cases
1. Which scientific label fits the specifically described step or feature? Supplied case: Gap between bridge ends.
Need a hint?
  • Look for the described feature: distance between supports.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.
2. Which scientific label fits the specifically described step or feature? Supplied case: Upright holding the beam.
Need a hint?
  • Look for the described feature: part carrying the structure.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.
3. Which scientific label fits the specifically described step or feature? Supplied case: Bridge folds during the supplied trial.
Need a hint?
  • Look for the described feature: stated performance goal is missed.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.

Your choices are temporary. Feedback appears after you check all the answers.

Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.

Check the subject sources

These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.