Shadows and Light Blocking

Active learning works well for shadows and light blocking because students need to manipulate objects and observe changes in real time. This hands-on approach helps them connect abstract ideas about light travel with visible patterns in shadow formation.

• Year 5
• Science
• 4 activities
• 30 min–50 min

Learning Objectives

1. Explain the formation of shadows by identifying the roles of light sources, opaque objects, and surfaces.
2. Predict how changes in the distance between an object and a light source, or an object and a surface, will alter shadow size.
3. Analyze how the angle of a light source affects the shape and orientation of a shadow.
4. Design a simple shadow puppet to cast a specific shape or form.
5. Critique the effectiveness of different shadow puppet designs in conveying a story element.

Project-Based Learning

⏱ 35 min·Pairs

Fair Test: Shadow Lengths

Provide torches, metre sticks, teddy bears, and paper screens. Students fix the screen distance and move the object between torch and screen, measuring shadow lengths at three positions. They record in tables and graph results to spot the pattern. Pairs discuss why lengths change.

Prepare & details

Explain how shadows are formed and why they change shape and size.

Facilitation Tip: During Fair Test: Shadow Lengths, ensure students measure shadow lengths multiple times and record data in a shared class chart to spot patterns together.

Setup: Flexible workspace with access to materials and technology

Materials: Project brief with driving question, Planning template and timeline, Rubric with milestones, Presentation materials

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Stations Rotation

⏱ 40 min·Small Groups

Stations Rotation: Light Angles

Set up three stations with torches at high, low, and side angles casting shadows from a fixed object. Groups spend 10 minutes at each, sketching shadows and predicting the next station's outcome. Whole class shares sketches to compare.

Prepare & details

Predict how the position of a light source will affect the shadow cast by an object.

Facilitation Tip: In Station Rotation: Light Angles, place a protractor at each station so students can measure angles precisely and relate them to shadow changes.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Project-Based Learning

⏱ 50 min·Small Groups

Design Challenge: Shadow Puppets

Students cut animal shapes from card, attach to sticks, and create a 2-minute story show behind a sheet with a torch. Practice predicts shadow effects from light position. Perform for class with peer feedback on clarity.

Prepare & details

Design a puppet show using shadows to tell a story.

Facilitation Tip: For Design Challenge: Shadow Puppets, provide a variety of opaque and translucent materials so students test which creates the clearest shadows.

Setup: Flexible workspace with access to materials and technology

Materials: Project brief with driving question, Planning template and timeline, Rubric with milestones, Presentation materials

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Project-Based Learning

⏱ 30 min·Pairs

Outdoor Prediction: Sun Shadows

Place sticks in ground at schoolyard spots. Pairs mark initial shadows, predict positions hourly using compass and sun path knowledge, then measure actuals. Compare predictions in plenary.

Prepare & details

Explain how shadows are formed and why they change shape and size.

Facilitation Tip: During Outdoor Prediction: Sun Shadows, give students time to sketch shadows at different times of day before measuring to reinforce the connection between sun position and shadow length.

Setup: Flexible workspace with access to materials and technology

Materials: Project brief with driving question, Planning template and timeline, Rubric with milestones, Presentation materials

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Teaching This Topic

Teach this topic by starting with simple, clear demonstrations that reveal light’s straight path. Avoid overcomplicating with diagrams early on, as hands-on experiences build stronger mental models. Research shows students grasp shadow concepts better when they actively test predictions and discuss discrepancies in small groups.

What to Expect

Successful learning looks like students using evidence from activities to explain how shadow size and shape change with distance and angle. They should confidently predict outcomes and revise ideas based on observations, not assumptions.

Watch Out for These Misconceptions

Common Misconception

During Fair Test: Shadow Lengths, watch for students who assume shadows remain the same size regardless of distance.

What to Teach Instead

Have them use the measuring tape and shared data chart to compare shadow lengths at different distances. Ask: ‘What pattern do you see in the numbers?’ to guide them toward the distance-shadow relationship.

Common Misconception

During Station Rotation: Light Angles, watch for students who think the shadow shape matches the light angle directly.

What to Teach Instead

Ask students to trace the shadow outline and the object’s outline on tracing paper, then compare angles. Prompt: ‘How does the light’s angle change the shadow’s edge?’ to highlight the connection.

Common Misconception

During Design Challenge: Shadow Puppets, watch for students who use translucent materials expecting clear shadows.

What to Teach Instead

Provide a torch and ask them to test their material choice immediately. Say: ‘Check the shadow with the torch on. Is it sharp or fuzzy?’ to redirect their thinking.

Assessment Ideas

Exit Ticket

After Fair Test: Shadow Lengths, give students a diagram with a light source, object, and screen. Ask them to draw the shadow and explain its size in one sentence. Then ask them to predict what happens to the shadow if the object moves closer to the light source.

Quick Check

During Station Rotation: Light Angles, circulate with a checklist and ask each group: ‘What happens to the shadow when you tilt the torch upward? Why?’ Listen for explanations that mention light’s straight path or angle changes.

Discussion Prompt

After Design Challenge: Shadow Puppets, pose the question: ‘How would you change the light source’s position to make your dog puppet’s tail wag?’ Facilitate a brief discussion where students share their ideas and justify them using shadow behavior they observed.

Extensions & Scaffolding

• Challenge early finishers to create a shadow that changes size without moving the object or light source, using only a mirror.
• Scaffolding for struggling students: Provide a template with labeled distances between light, object, and screen to guide their measurements.
• Deeper exploration: Challenge students to explain why shadows cast by the sun are fuzzier than those cast by a torch, using their understanding of light source size.

Key Vocabulary

Opaque	An object that does not allow light to pass through it, causing a shadow to form behind it.
Light Source	Anything that emits light, such as the sun or a lamp, which travels in straight lines.
Shadow	A dark area formed when an opaque object blocks light from a source.
Projection	The act of casting a shadow onto a surface, where the shape and size depend on the object's position relative to the light and surface.