Distance–Time Graph Simulation — Description
The simulation is a fully animated, responsive physics tool built for GCSE Science/Physics. It runs entirely in the browser with no internet dependency beyond loading the Lexend font.
What students see on screen:
The canvas is split into two zones. The top third shows a live track scene — a coloured car drives along a road, with its speed displayed above it in m/s and motion arrows showing direction. The bottom two-thirds show the distance–time graph drawing itself in real time as the car moves, so students can watch the line being plotted and make the direct connection between what the car does and what the graph looks like.
Four scenarios accessible via tabs:
- ⚡ Constant Speed — car moves steadily, graph plots a straight diagonal line. A rise/run triangle annotates the gradient live, labelled with the calculated speed (100 ÷ 5 = 20 m/s).
- ⏸ Stationary — car moves to a position then stops. The graph flattens to a horizontal line and a “gradient = 0 / speed = 0 m/s” annotation appears automatically.
- ▶❙ Stop & Go — two bursts of movement with a rest in between. Students can see that the second slope is steeper than the first, meaning higher speed.
- ↩ Return Journey — car travels out, pauses, then comes back. The graph line rises, flattens, then falls — with the fact box explaining that a falling line means the distance from the starting point is decreasing.
Each scenario has a fact bar at the bottom that updates per phase to explain what is happening physically and graphically, written in plain English. A Replay button restarts the animation. The Accessibility drawer (top-right) offers slow motion, pause, larger text, dyslexia-friendly spacing, and text-to-speech.
Suggested Class Activity
“Graph Detective” — Match the Motion
Year group: KS4 (Year 10–11) · Time: 20–30 minutes · Group size: Pairs or threes
Learning objective: Students interpret distance–time graphs and connect graph shape to physical motion.
Setup (5 min)
Give each pair a printed worksheet with six unlabelled distance–time graphs — two straight diagonals of different steepness, one flat line, one with a flat section in the middle, one that rises then falls, and one that rises steeply then shallowly. Do not tell them which scenario they correspond to.
Activity Part 1 — Predict (5 min)
Before touching the simulation, students write one sentence under each graph describing what they think the object is doing. They also calculate the gradient of each sloped section using the grid values and write the speed in m/s.
Activity Part 2 — Investigate (10 min)
Students open the simulation and work through each of the four tabs. For each one they:
- Watch the animation fully once, then pause it at different points using the Accessibility drawer
- Sketch the shape of the graph from memory in their books
- Note the speed shown above the car and check it matches the gradient they read from the graph
- Write the matching keyword — constant speed, stationary, stop and go, return journey
Activity Part 3 — Discussion (5–10 min)
Bring the class together and discuss these questions:
- Which scenario had the fastest overall speed? How could you tell from the graph without calculating?
- In the Return Journey, the car is clearly moving — so why does the graph go downward rather than upward?
- If two objects had graphs that were both straight lines but one was steeper, what does that tell you about their speeds?
- What would the graph look like for an object accelerating? (Extension — leads into velocity–time graphs)
Differentiation:
- Support: Use the slow motion and pause features in the Accessibility drawer; the fact bar provides scaffolded sentence starters for each phase
- Core: Match the six printed graphs to the four simulation scenarios (two are distractors students must identify as not shown)
- Extension: Ask students to invent their own scenario — describe it in words, sketch the predicted graph, then verify using the Replay button and their calculated gradients
Assessment: Exit ticket — show one unseen distance–time graph and ask students to describe the journey in three sentences, including at least one speed calculation.