Science · Primary 5

Active learning ideas

Formation of Shadows and Eclipses

Active learning works well for this topic because shadows and eclipses are dynamic events that require hands-on observation to correct misconceptions. Students learn best when they manipulate light sources, objects, and screens to see how shadow size and shading change in real time.

• MOE Syllabus Outcomes
• MOE: Light and Shadows - G7
• MOE: Earth and Space - G7

• 20–35 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Progettazione (Reggio Investigation)
• 35 min · Small Groups

Progettazione (Reggio Investigation): Shadow Size Variables

Provide flashlights, objects of different sizes, and screens. Groups measure shadow lengths as they move the light source closer or farther, and change object size. Record data in tables and graph results to identify patterns.

Explain how the size and shape of a shadow are influenced by the light source and object.

Facilitation Tip

During the Shadow Size Variables activity, remind students to measure shadow dimensions at consistent intervals from the screen to ensure accurate comparisons.

What to look for

Provide students with a diagram showing the Sun, Earth, and Moon in different alignments. Ask them to label which alignment causes a solar eclipse and which causes a lunar eclipse, and briefly explain why for each.

• Understand
• Apply
• Analyze
• Self-Awareness
• Social Awareness
• Relationship Skills

Activity 02

• Simulation Game
• 25 min · Whole Class

Demo: Umbra and Penumbra

Use a large light source and small object to project shadows on a wall. Students observe the sharp umbra edge and fuzzy penumbra, then switch to a point source for comparison. Sketch and label observations.

Differentiate between umbra and penumbra in shadow formation.

Facilitation Tip

In the Umbra and Penumbra demo, dim the classroom lights to make the penumbra more visible against the screen.

What to look for

During a demonstration with a flashlight, object, and screen, ask students to predict how moving the flashlight closer or farther away will change the shadow's size. Then, ask them to describe the difference between the umbra and penumbra they observe.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 30 min · Pairs

Model: Solar Eclipse Simulator

Pairs use a lamp as Sun, styrofoam ball as Earth, and smaller ball as Moon. Align them to cast umbra and penumbra on Earth, noting positions for total and partial eclipses. Rotate to mimic motion.

Analyze the conditions necessary for solar and lunar eclipses to occur.

Facilitation Tip

For the Solar Eclipse Simulator, provide a checklist of required alignments to guide students' testing of different configurations.

What to look for

Pose the question: 'Imagine you are on the Moon during a solar eclipse as seen from Earth. What would you see happening?' Guide students to discuss the role of the Earth blocking the Sun's light from their perspective.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 20 min · Pairs

Pairs: Lunar Eclipse Setup

In pairs, position a lamp, Earth ball, and Moon ball opposite the light. Observe Earth's shadow stages on the Moon, timing the full coverage. Discuss why it appears red.

Explain how the size and shape of a shadow are influenced by the light source and object.

Facilitation Tip

In the Lunar Eclipse Setup pairs activity, ask students to rotate roles between moving the Moon model and recording observations to keep both engaged.

What to look for

Provide students with a diagram showing the Sun, Earth, and Moon in different alignments. Ask them to label which alignment causes a solar eclipse and which causes a lunar eclipse, and briefly explain why for each.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teachers should introduce the topic by having students observe their own shadows outdoors at different times of day to build intuition. Avoid rushing to definitions; instead, let students describe patterns they notice first. Research shows that students grasp eclipse alignments better when they physically model the tilted orbits rather than relying on diagrams alone.

Successful learning looks like students accurately predicting shadow changes based on light distance and size, clearly distinguishing between umbra and penumbra, and explaining the precise alignments needed for eclipses. They should use precise vocabulary and justify their observations with evidence from their trials.

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Watch Out for These Misconceptions

• During the Shadow Size Variables investigation, watch for students assuming the shadow size matches the object's size without considering light distance.

  Pause the activity and ask students to compare shadows from a nearby light versus a distant light, prompting them to measure and record changes in size to build accurate observations.

• During the Umbra and Penumbra demo, watch for students describing both shadow areas as equally dark.

  Have students hold a piece of paper in the penumbra and observe that some light passes through, then ask them to explain why the umbra is fully dark based on the light rays they see.

• During the Solar Eclipse Simulator activity, watch for students assuming eclipses happen every new or full moon.

  Ask students to adjust their models to show the Moon's tilted orbit and explain why most alignments do not result in an eclipse, using their hands-on trials as evidence.

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Methods used in this brief

• Progettazione (Reggio Investigation)
• Simulation Game