Motion Description

Overview

Lesson 2 builds students’ core language and representations for motion by distinguishing distance from displacement and using graphs and simple charts to describe how an object changes position over time.

Learning intentions

• Students will be able to describe motion using distance and displacement appropriately.
• Students will be able to interpret distance-time and displacement-time graphs.
• Students will be able to create a simple chart/graph from motion data and explain what the representation shows.
• Students will be able to communicate motion descriptions using clear scientific terms and units.

Success criteria

• I can define distance as “how far,” and displacement as “how far and in what direction from start.”
• I can explain why displacement can be positive, negative, or zero while distance is always non-negative.
• I can read a graph to describe changes in position and use evidence from points/segments.
• I can produce a short written or oral description that links values (distance/displacement) to the graph.

Curriculum links

• Motion and forces learning focus: describing and representing motion using distance, displacement, time, and graphs.
• Inquiry and communication: collecting/using data representations, explaining relationships, and using scientific language.
• Skills: interpreting and creating graphs/charts to support claims.

Lesson structure (45 minutes)

1. 0–5 min: Warm-up prompt

• Display two scenarios: “A student runs from Home to School and back to Home” and “A student runs from Home to School.”
• Students quickly write: which value would be the same/different for distance vs displacement. Share 2–3 responses.

2. 5–12 min: Mini-lesson—distance vs displacement

• Model with a number line and a simple path diagram: start point, end point, direction arrow.
• Explain that displacement depends on start and finish location, while distance is the total path length travelled.

3. 12–22 min: Guided graph reading

• Provide a teacher example of a displacement-time graph (e.g., starts at 0 m, moves positive direction, then returns toward 0).
• Students answer:
• What is the displacement at key times?
• What does the slope/segment direction suggest?
• Where would distance show “always increasing or non-negative” in contrast to displacement?
• Check answers using quick “thumbs” and targeted questioning.

4. 22–34 min: Hands-on data-to-chart task

• In pairs, students receive a small motion dataset (time, position). They calculate:
• displacement from the starting position
• distance travelled by tracking changes in position along the path (can be guided with a worked example of totals for each interval)
• Students create a simple chart and, if time allows, a line graph for displacement-time (primary) and optionally distance-time (secondary).
• Teacher circulates to support interpretation of direction and sign.

5. 34–42 min: Motion description challenge

• Students write a 5–7 sentence “motion description” using a sentence frame:
• “At time __, the displacement is __ m, meaning __ direction from the start. The distance travelled by then is __ m.”
• Students include one claim supported by the graph/chart (e.g., “From 2–4 s the object is moving back toward the start.”).

6. 42–45 min: Exit ticket

• One short question: “An object ends where it started after moving for some time. What are distance and displacement?” plus a request to justify using words or a sketch.

Resources

• Teacher slides or board visuals showing distance vs displacement (path diagram and number line)
• Example displacement-time and distance-time graphs (printed or digital)
• Student data table: time intervals and position values (with units)
• Graph paper or digital graphing template
• Sentence frames for motion descriptions
• Pair work sheet with calculations support (start position, sign conventions)
• Markers, rulers, and protractors not needed (keep it position/number-line based)
• Exit ticket slips

Assessment

• Formative: circulate during graph reading and data calculations; note misunderstandings about sign, direction, and units.
• Formative: review pair charts/graphs for correctness of displacement and distance calculations.
• Summative (small): exit ticket accuracy and justification quality.

Differentiation

• Support for ESL learners:
• Provide sentence frames and a word bank (distance, displacement, start, finish, direction, meters, time, increases/decreases).
• Use visuals (path diagrams, number line) alongside verbal explanations.
• Allow oral responses for calculations reasoning before written graph descriptions.
• Support for students needing scaffolding:
• Provide a partially completed table and a worked mini-example for the first interval.
• Offer a “sign rule” card: displacement is positive in the chosen direction from start, negative opposite.
• Extension for students ready for more challenge:
• Ask students to compare how distance-time and displacement-time graphs differ for the same motion and explain why.
• Challenge: describe what happens if the start point changes (how displacement values shift).
• SEN/learning needs:
• Provide step-by-step calculation checklist and allow use of calculators for arithmetic while ensuring conceptual explanation remains required.
• Offer graphic organizers for turning data into a written claim-evidence statement.