Explore a torch model, arrange evidence and decide what makes a fair test.
What it is about
Interpret a fair test of object/source distance and shadow size.
Year 3 · 7–8 years · 30 challenges
Before you begin
- KS1 habitats, plant needs, healthy choices and material tests.
What the class will do
- Predict and experiment · 8 challenges
Explore the shadow
Predict together. Move only the torch, observe the shadow and record the requested result.
- Build a sequence · 6 challenges
Arrange the evidence
Use each record’s evidence. Agree the requested order before placing the cards.
- Choose and explain · 16 challenges
Explain a fair test
Think, compare with a partner and choose the claim supported by the evidence.
Using it in class
Full bank: 30–45 minutes with discussion; select 5–8 challenges for a short round. Everyone predicts before a rotating representative tries. Model numbers are relative sizes. Supplement with supervised real torch tests; never look at the Sun.
Give everyone time to think and discuss before one pupil acts at the board. The class explains and confirms together; hints and explanations stay until you move on.
Use an up-to-date browser on a computer connected to a whiteboard or shared display. Touch, mouse and keyboard; optional audio and reduced motion. No pupil accounts or personal devices.
Choose from 5 challenges up to the full activity. Discussion determines the duration: you set the pace.
Teacher Pro access includes all 30 challenges, interactive materials, hints and explanations for this activity.
Shadows appear
Reflection and safety
Seeing needs light