Read position-time graph features
Read position-time graph features using supplied evidence and a solved model.
About 25 minutes, plus any extended practice
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 or a browser document for a labeled drawing, table or explanation.
- Worked problem inputs: Position rises by 6 m over 3 s, then stays fixed for 2 s. Explain both graph segments.
- Assessment case 1: A position-time segment rises from 2 m to 10 m over 4 s. What follows? Which inference or prediction is best supported?
- Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Line falls as time increases.
- Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Line remains at one position.
- Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Curve becomes steeper.
- Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Position increases at constant rate.
- Assessment case 6: Position remains 7 m from time 3 s to 8 s. What is supported? Which inference or prediction is best supported?
Learn the idea
Slope on a position-time graph gives velocity. A horizontal line represents constant position. Curving graphs indicate changing slope; their direction must be interpreted from the chosen coordinate system.
Positive slope means position increases with time. Negative slope means position decreases with time. Horizontal means position stays constant. Changing slope means velocity changes over the interval.
For the supplied mechanism problem, Position rises by 6 m over 3 s, then stays fixed for 2 s. Explain both graph segments. The first segment has average slope 6/3=2 m/s. The horizontal segment has zero velocity. Five seconds of elapsed time do not mean five seconds of motion.
- Read the supplied problem and mark the structures, processes or quantities named: Position rises by 6 m over 3 s, then stays fixed for 2 s. Explain both graph segments.
- Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
- Write a causal explanation or calculation, showing how each observation supports the result.
- Compare your reasoning with the worked solution; name a condition that would change or limit the inference.
See the method in action
Worked supplied problem: Position rises by 6 m over 3 s, then stays fixed for 2 s. Explain both graph segments. Solution: The first segment has average slope 6/3=2 m/s. The horizontal segment has zero velocity. Five seconds of elapsed time do not mean five seconds of motion. This conclusion uses the stated observations and the mechanism explained above; it does not establish every unmeasured feature of a real organism, device or place.
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 “position increases with time” to justify positive slope; do not sort by the name alone.
- Distinguish negative slope (position decreases with time) from a different process occurring in the same situation.
See the answer and explanation
Its average velocity is(10−2)/4=2 m/s.
Slope is position change divided by elapsed time; a straight slope does not imply acceleration.
Take it further
New graph task: position is 0 m at 0 s, 8 m at 4 s, then 8 m at 7 s. Expected: first slope 2 m/s, then zero; a horizontal position segment means stationary in this coordinate model.
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.
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.