Build, Test, Improve

Overview

In this tenth lesson of Playground Physics and Design, teams build and test one working playground-feature prototype using recycled and classroom materials. They make predictions, collect repeated evidence, and improve one variable at a time during a structured engineering pit-stop conference.

Learning intentions

• WALT explain how pushes, pulls, friction and gravity affect movement.
• WALT design and build a prototype that is stable and fit for purpose.
• WALT make fair tests, record repeated results and identify patterns.
• WALT use evidence to suggest one useful improvement.
• WALT work safely and respectfully as a team.

Success criteria

• I can describe what I predict will happen and why.
• I can test one feature in a consistent way and record at least three results.
• I can identify whether my prototype moved, stopped, stayed stable or carried a load as intended.
• I can change one variable and explain how the evidence supports my improvement.

Curriculum links

• Physical world: Explore how pushes, pulls, gravity and friction affect the movement and stopping of objects.
• Nature of science: Ask questions, make predictions, carry out fair tests, record observations and use evidence to communicate findings.
• Technology and design: Develop, test and improve a design for a particular user or purpose.
• Key competencies: Thinking; managing self; participating and contributing; relating to others; using language, symbols and texts.

Lesson structure (45 minutes)

1. 0–5 min – Hook and learning goal Open with the hook and learning-intention slides. Show a simple comparison of a stable and unstable playground feature, then ask: “What could make one safer, faster or easier to use?” Briefly revisit pushes, pulls, friction, gravity and stability from earlier lessons. Emphasise that today’s goal is not a perfect model but useful evidence for improvement.

2. 5–10 min – Safety and testing demonstration Use the safety and fair-testing slides to introduce careful handling of scissors, tape, skewers and small parts. Demonstrate one test, such as rolling a toy along a ramp: keep the release point, surface, object and measuring method the same each time. Explain that only one variable should change during an improvement test.

3. 10–13 min – Team planning Place students in five teams of five and allocate each team its existing playground-feature design. Distribute the prototype testing record. Teams choose one feature to build, such as a ramp, slide, swing, seesaw or moving gate, and write a prediction using: “We think… because…”. Assign roles: builder, equipment manager, tester, recorder and reporter.

4. 13–28 min – Build the prototype Teams construct one small working feature using recycled materials. Prompt them to consider: “Where is the force?” “What will make it move or stop?” and “How will it stay balanced?” Circulate to check that designs are safe, manageable and suitable for testing. Students may simplify their design rather than rushing to add extra parts.

5. 28–36 min – Repeated testing and recording Teams carry out at least three consistent tests. Depending on the feature, they record speed or travel time, distance, stopping behaviour, stability, or how much weight it can hold. Students record observations and numbers on the prototype testing record. Remind testers to reset the model in the same way and to stop immediately if a part becomes unsafe.

6. 36–42 min – Engineering pit-stop conference Return to the pit-stop discussion slides. Each team identifies one variable to change, such as ramp height, surface material, wheel size, support position or load. Teams make the change, repeat a short test, and compare the new result with the original. In a one-minute conference, each team reports: “We changed…, our evidence showed…, so next we would…”.

7. 42–45 min – Plenary and exit response Use the reflection and plenary slide to ask: “Why are repeated tests more useful than one test?” and “How did friction, gravity, force or stability affect your feature?” Students complete the final reflection on the prototype testing record and return materials to labelled tubs.

Resources

• the complete lesson slide deck
• the prototype testing record
• Recycled cardboard, paper tubes, boxes, bottle tops and craft sticks
• Wooden blocks, string, rubber bands, paper cups and fabric or different-surface materials
• Tape, glue, child-safe scissors and rulers or metre rulers
• Toy cars, counters or other small test objects
• Stopwatch or classroom timer
• Small masses such as counters or linking cubes
• Five team role cards or a board display
• Safety goggles if using materials that may spring, snap or scatter

Assessment

• Observe team planning, safe construction, role participation and use of scientific vocabulary.
• Check the worksheet for a prediction, a consistent method, at least three recorded results and a comparison after changing one variable.
• Listen to the pit-stop conference for an evidence-based explanation rather than an unsupported opinion.

Differentiation

• Provide a prepared base, pre-cut materials, a visual test sequence and sentence frames: “Our evidence shows…” and “Next we could…”.
• Allow students to record results with drawings, tally marks, numbers or teacher-scribed comments; pair developing writers with a supportive recorder.
• Offer extension through a more precise measurement, a second repeated trial or a comparison of two surfaces while keeping other conditions the same.
• Support EAL learners with gesture, labelled picture examples, paired rehearsal and a small word bank: force, push, pull, friction, gravity, stable, distance and predict.