Science · Year 2

Active learning ideas

Blocking Light to Make Shadows

Active, hands-on exploration helps students grasp that light travels in straight lines because they see rays in action. When children manipulate objects and light sources themselves, abstract concepts like shadow formation become visible and memorable through direct observation.

• ACARA Content Descriptions
• AC9S2U03

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 35 min · Pairs

Torch Distance Challenge: Shadow Sizes

Pairs set up a torch, object, and screen in a dark space. Place the object at three distances from the torch, predict shadow size each time, then measure with rulers. Record results in a class chart and explain patterns.

Explain what causes a shadow to form.

Facilitation Tip

During the Torch Distance Challenge, circulate with a ruler and ask pairs to measure shadow length at 10cm, 20cm, and 30cm from the torch to anchor their observations in data.

What to look for

Provide students with a flashlight, various opaque objects (e.g., a block, a toy animal, a cutout shape), and a blank wall or screen. Ask them to hold up an object between the flashlight and the wall and observe the shadow. Then, ask: 'What happens to the shadow when you move the object closer to the light? What happens when you move it further away?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 02

• Experiential Learning
• 40 min · Small Groups

Shape Shadow Match-Up: Object Gallery

Small groups project shadows of various objects like balls, sticks, and leaves onto paper using torches. Mix projections on a wall, then match each shadow to its object. Note how edges transfer from object to shadow.

Compare the shadows created by different shaped objects.

Facilitation Tip

For the Shape Shadow Match-Up, provide a mix of objects and pre-cut shapes so students notice how edges define shadow outlines clearly.

What to look for

Show students a picture of a sundial. Ask: 'How does a sundial work? What is blocking the light to make the shadow move? What do you think would happen to the shadow if the sun suddenly disappeared?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Experiential Learning
• 45 min · Whole Class

Outdoor Stick Shadows: Time Tracking

Whole class places identical sticks in sunny spots and marks shadow tips with chalk every 15 minutes. Measure lengths, sketch changes, and predict next positions. Compare morning and afternoon data.

Predict how moving an object closer to a light source affects its shadow.

Facilitation Tip

In Outdoor Stick Shadows, assign small groups a fixed stick length and have them mark shadow tips with chalk every 15 minutes to track changes over time.

What to look for

Give each student a piece of paper. Ask them to draw a simple picture showing a light source, an opaque object, and the shadow it creates. Have them label each part. Then, ask them to write one sentence explaining why the shadow is there.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 04

• Experiential Learning
• 30 min · Pairs

Puppet Shadow Play: Prediction Game

Individuals craft simple puppets from card, then pairs use torches to test shadow predictions by changing distance or angle. Perform short shows, noting size shifts. Share best observations.

Explain what causes a shadow to form.

What to look for

Provide students with a flashlight, various opaque objects (e.g., a block, a toy animal, a cutout shape), and a blank wall or screen. Ask them to hold up an object between the flashlight and the wall and observe the shadow. Then, ask: 'What happens to the shadow when you move the object closer to the light? What happens when you move it further away?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Teach this topic by letting students experience the physics firsthand before naming concepts. Avoid front-loading definitions; instead, let observations guide vocabulary. Research shows that prediction-observation-reflection cycles deepen understanding more than lectures. Keep materials simple and repeatable so students can test ideas independently.

Students will confidently explain that light travels straight, objects block light to create shadows, and shadow size changes with distance. They will use precise vocabulary like ‘opaque,’ ‘translucent,’ and ‘transparent’ when describing their findings.

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Watch Out for These Misconceptions

• During the Torch Distance Challenge, watch for students who think shadows stay the same size regardless of object position.

  Have pairs measure shadows at 10cm, 20cm, and 30cm from the torch, then graph results on shared paper to reveal the clear pattern that closer objects cast larger shadows.

• During the Shape Shadow Match-Up, watch for students who think all objects block light equally.

  Ask groups to rotate through stations with different materials and rank shadow darkness from 1 (darkest) to 5 (lightest), then discuss why some materials block more light than others.

• During Puppet Shadow Play, watch for students who explain shadows by saying light bends around objects.

  Place a straight-edged object between the torch and screen, then ask students to trace the edge of the shadow and compare it to the object’s shape to see that light travels in straight lines without bending.

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Methods used in this brief

• Experiential Learning