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A1.10 · Draw and justify conclusions from inquiry and research evidence

Learn to draw and justify conclusions from inquiry and research evidence through clear examples and targeted practice.

Ontario Grade 11 Physics

Scientific Investigation Skills and Career Exploration

SPH3U A1.10: Use inquiry and research evidence to support a careful conclusion

Physics conclusions should follow from evidence. Evidence can come from a planned inquiry, such as observations or measurements, or from research, such as information collected from published sources. A conclusion answers the question using that evidence. It is not a guess, and it is not automatically true just because it sounds reasonable. In this lesson, sample evidence statements are invented for practice. They are not presented as real laboratory results or as reports from actual research. The central task is to connect evidence to a conclusion and explain the strength and limits of that connection.

What you will learn

1. From a question to a conclusion

A scientific inquiry begins with a question that can be examined. Research also begins with a question, but it uses information gathered from sources rather than collecting new observations directly. In either case, define what is being considered. This is the system: the object, group, or process that the question is about. For example, a question might concern a cart moving along a track, or information about how sound changes with distance.
A variable is a feature that can change or be described. The independent variable is the feature deliberately changed or compared. The dependent variable is the outcome observed or measured. A controlled variable is a feature kept the same so it does not provide another explanation for a result. These terms help make a question specific. They are useful only when they fit the inquiry being described.
Evidence is information that bears on the question. In an inquiry, it may include observations or measurements. In research, it may include findings reported by sources. A conclusion is a statement that answers the question. Justification is the reasoning that shows how the evidence supports that statement. An explanation describes why a pattern may occur; it should not be confused with the evidence itself.
A useful structure is: state the conclusion, cite the relevant evidence, then explain the link. Include a limit if the evidence does not settle the question completely. This structure keeps opinion separate from what was observed or reported.

2. Look for patterns and judge evidence

Before drawing a conclusion, read the evidence carefully. Check what was observed, what was compared, and whether the information actually addresses the question. In quantitative evidence, check labels and units. A distance in metres is not interchangeable with a time in seconds. In a motion graph, for example, the labelled axes tell you which quantities are being compared; a pattern cannot be interpreted reliably if the axes are misunderstood.
A trend is a general pattern in evidence. Evidence may show that one quantity tends to increase when another increases, or that a result stays similar across several comparisons. A trend supports a conclusion only if the quantities and conditions are relevant to the question. Do not treat one unusual result as the whole pattern without considering the rest of the evidence.
Repeatability means that repeated observations or measurements under similar conditions give similar results. Consistency across several relevant sources can also make a research conclusion more convincing. Neither guarantees that the evidence is free of problems. Ask whether the method matches the question, whether important conditions were controlled or considered, and whether other explanations remain possible.
A limitation is a feature of the evidence or method that restricts what can be concluded. A small number of observations, unclear measurement details, or sources that do not examine the same conditions can limit confidence. A limitation does not make all evidence useless. It tells you how narrowly to word the conclusion. For example, evidence from one set of conditions may support a statement about those conditions, but not automatically about every situation.

3. Build a justified conclusion

Use a clear chain of reasoning. First, answer the inquiry question in a direct sentence. Next, point to the evidence that matters. Then explain why that evidence supports the answer. Finally, identify an important limitation or state what additional evidence would help.
Use precise language. If evidence shows a pattern, say that it supports or is consistent with a conclusion. Avoid saying that it proves a broad rule when the evidence covers only a few cases. Keep measured evidence separate from an interpretation. For example, “the recorded values increased” describes evidence; “the change was caused by the altered condition” is a causal conclusion and needs evidence that addresses other possible causes.
A fair conclusion also considers evidence that does not fit the main pattern. Do not hide an inconvenient observation. It may point to measurement variation, a condition that was not controlled, or a conclusion that needs to be narrower. When sources disagree, compare what each source examined and how it gathered information before deciding what the disagreement means.
A proposed procedure describes what someone plans to do. A simulation represents a situation using a model or computer program. Neither is, by itself, a completed physical measurement. State clearly whether information comes from observed measurements, reported research, a proposed plan, or a simulated model. This distinction prevents a claim from sounding more directly tested than it was.

Worked example

A cart inquiry with a limited conclusion

Practice evidence statement (invented for learning, not actual laboratory data): A class inquiry compares a cart on the same track under two labelled conditions. The record says the cart covered more distance during the same stated time interval in condition B than in condition A. Draw and justify a conclusion, and identify a limit.
  1. Answer the question
    The system is the cart moving on the track. The evidence supports the conclusion that, in this comparison, the cart covered more distance in the stated time interval under condition B than under condition A. This wording stays close to the reported comparison.
  2. Connect evidence to the conclusion
    Distance and time describe the motion being compared. Because the stated time interval is the same, the greater recorded distance in condition B supports the claim that the cart's motion was faster in that comparison. The evidence does not include numerical values, so it does not support a calculated difference.
  3. State a limitation
    The statement does not say how many trials were made or whether other conditions were kept the same. So the evidence supports a limited comparison, but it is not enough to claim that condition B will always make any cart move faster.
Answer: In the described comparison, the cart covered more distance in the same time under condition B, supporting faster motion in that comparison. The evidence does not establish that the pattern will occur in all conditions.
Check: The conclusion uses only the stated evidence, does not invent measurements, and limits its scope.

Worked example

Comparing research summaries

Practice research packet (invented for learning, not actual published research): Summary A reports that a sound-level comparison found lower readings farther from a source. Summary B describes a different room and says that its report did not find a clear distance pattern. What conclusion is justified?
  1. Compare the conditions
    Both summaries concern sound and distance, but they describe different rooms. The room conditions may differ, and the packet gives no details that would show the comparisons were otherwise alike.
  2. Use both pieces of evidence
    Summary A supports a decrease in sound readings with greater distance in the conditions it describes. Summary B does not report a clear pattern in its different room. The two statements do not support a single unrestricted rule for every room.
  3. Write a careful conclusion
    A justified conclusion is that the research summaries are not fully consistent across the described settings. More information about the rooms, methods, and reported readings would help explain the difference. Do not discard Summary B simply because it conflicts with Summary A.
Answer: The summaries provide mixed evidence: one reports lower sound readings farther from the source, while the other reports no clear pattern in a different room. The evidence is insufficient for a broad claim covering all rooms.
Check: The conclusion recognizes both summaries and identifies missing context instead of treating one as decisive.

Worked example

A simulation is not a physical measurement

Practice evidence statement (invented for learning): A computer simulation represents a bouncing object. Across the displayed runs, the model shows less rebound after each bounce. A student concludes that a real object always loses the same amount of motion at every bounce. Evaluate that conclusion.
  1. Identify the evidence type
    The information comes from a simulation, which is a model of a situation. It is not a record of a completed physical experiment. Its result depends on how the model was set up.
  2. Compare claim and evidence
    The displayed runs support a narrower statement: this model shows less rebound after each bounce in the runs described. The student's words “real object,” “always,” and “the same amount” go beyond the evidence. The statement does not say that real objects were tested or that the decrease was equal each time.
  3. Revise the conclusion
    A better conclusion names the model and its limits. To make a claim about real objects, evidence from relevant physical observations or research would be needed, and the model's assumptions would also need to be considered.
Answer: The simulation supports only the conclusion that the model displayed less rebound across the described runs. It does not establish that real objects always lose the same amount at every bounce.
Check: The revised claim distinguishes simulated results from physical evidence and avoids words broader than the evidence.

Common mistakes and how to avoid them

Repeating the evidence without answering the inquiry question.
Correction: State a direct conclusion, then identify the evidence that supports it.
Claiming that one comparison proves a rule for every situation.
Correction: Limit the conclusion to the conditions and evidence described.
Treating an explanation as if it were an observation.
Correction: Label what was observed or reported separately from your proposed reason for it.
Calling a proposed procedure or simulation a completed physical experiment.
Correction: Name the information source accurately and describe what it can support.
Ignoring evidence that does not match the preferred conclusion.
Correction: Consider all relevant evidence and explain how disagreement limits confidence.

Lesson summary

Check your understanding

Question 1

A report describes one comparison in which a longer distance is associated with a lower recorded sound level. Which conclusion is best supported?
  1. Sound level is lower at every greater distance in every setting.
  2. In the reported comparison, the longer distance was associated with a lower recorded sound level.
  3. Distance is the only factor that can affect sound level.
  4. The report proves why the sound level changed.
Show answer and explanation
In the reported comparison, the longer distance was associated with a lower recorded sound level.
This choice describes only the reported pattern. The evidence as given does not establish a universal rule or identify the cause.

Question 2

A computer model displays a pattern for a moving object. What should a conclusion say about the evidence?
  1. The pattern was measured in a physical experiment.
  2. The model's result is evidence about what its simulation displayed, not by itself a physical measurement.
  3. The model proves that every real object behaves the same way.
  4. The result can be ignored because simulations never provide useful information.
Show answer and explanation
The model's result is evidence about what its simulation displayed, not by itself a physical measurement.
A simulation can provide information about the model, but it is not the same as a completed physical measurement and does not automatically establish a universal claim.

Question 3

Two research summaries give different results for different conditions. What is the strongest next step?
  1. Keep only the summary that matches the expected result.
  2. Average the conclusions without checking what was studied.
  3. Compare the conditions and methods, then state how the disagreement limits the conclusion.
  4. Claim that neither summary contains any evidence.
Show answer and explanation
Compare the conditions and methods, then state how the disagreement limits the conclusion.
The conditions and methods may help explain the difference. Considering both summaries supports a more careful conclusion.

Key terms

Evidence
Information from observations, measurements, or research that is relevant to a question.
Conclusion
A statement that answers a question using the available evidence.
Justification
Reasoning that explains how evidence supports a conclusion.
Variable
A feature that can change or be described in an inquiry.
Trend
A general pattern in evidence.
Limitation
A feature that restricts how strongly or broadly evidence can support a conclusion.
Simulation
A model-based representation of a situation, often made with a computer.

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About this lesson and its review

Published by DoAssignment. This AI-assisted lesson follows Ontario Grade 11 Physics (SPH3U), expectation A1.10. It is a study resource, not an official curriculum publication.

Before publication, the draft is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability, and then requires administrator approval. Errors can still occur, so corrections are welcomed.

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