Science · Grade 1 · Energy in Our Lives · Term 3

Light and Shadows

Students will investigate how light travels in a straight line and how objects block light to create shadows through hands-on experiments and role-play.

• Ontario Curriculum Expectations
• 1-PS4-2

About This Topic

Light and shadows help Grade 1 students grasp basic properties of light as energy. They investigate how light travels in straight lines from sources such as flashlights or sunlight. Students discover that opaque objects block this light, casting shadows on surfaces behind them. Through experiments, they predict and observe changes in shadow size and shape when adjusting the position of the light source, object, or screen.

This topic fits within the Energy in Our Lives unit by linking light energy to everyday observations like playground shadows or room lighting. Students answer key questions about shadow formation, predict changes from light movement, and design shadow puppets. These activities build prediction, observation, and creative problem-solving skills essential for scientific thinking.

Hands-on experiments with flashlights in darkened spaces let students manipulate variables directly. Role-playing as shadow creators reinforces concepts through movement and laughter. Active learning benefits this topic most because tangible interactions turn abstract straight-line travel into visible evidence, helping students internalize predictions and designs through repeated, joyful trials.

Key Questions

1. Explain what causes a shadow to form.
2. Predict how the size and shape of a shadow change when the light source moves.
3. Design an activity to create different shadow puppets.

Learning Objectives

• Identify the source of light in various scenarios.
• Explain how an opaque object causes a shadow to form.
• Predict how the position of a light source affects the size and shape of a shadow.
• Design and demonstrate a simple shadow puppet using light and an object.
• Compare shadows created by different light sources.

Before You Start

Properties of Light

Why: Students need a basic understanding that light is a form of energy that allows us to see.

Observation Skills

Why: This topic requires students to carefully observe how light and objects interact to create shadows.

Key Vocabulary

Light Source	Anything that produces light, such as the sun, a lamp, or a flashlight.
Opaque Object	An object that does not allow light to pass through it, causing a shadow to form.
Shadow	A dark area formed when an opaque object blocks light from a light source.
Straight Line	Light travels in a path that does not bend or curve.

Watch Out for These Misconceptions

Common Misconception

Shadows are always the same size as the object.

What to Teach Instead

Shadows enlarge or shrink based on light source distance and screen position. Hands-on flashlight trials let students see this directly, compare predictions in pairs, and adjust mental models through evidence.

Common Misconception

Light curves around objects to make shadows.

What to Teach Instead

Light travels only in straight lines, so objects fully block it. Role-play with bodies and lights reveals blocked paths clearly. Group discussions help students articulate why curves do not match observations.

Common Misconception

Shadows form only from the sun.

What to Teach Instead

Any light source creates shadows if strong enough. Classroom experiments with flashlights prove this. Collaborative stations build confidence in generalizing from multiple sources.

Active Learning Ideas

Stations Rotation: Shadow Manipulators

Prepare four stations with flashlights, objects of varying sizes, and screens. Students rotate every 10 minutes to move lights closer or farther, observe shadow changes, and sketch predictions versus results. End with a gallery walk to share drawings.

45 min·Small Groups

Pairs: Shadow Puppet Design

Partners trace hands or cut shapes from cardstock to make puppets. They test puppets with flashlights on walls, adjusting distances to create large or small shadows. Groups perform short stories with puppets for the class.

30 min·Pairs

Whole Class: Body Shadow Hunt

Dim lights and use a single flashlight. Students take turns positioning bodies to cast shadows, predicting shapes and sizes as the light moves around the room. Class discusses matches between predictions and observations.

25 min·Whole Class

Individual: Light Path Drawings

Give each student a flashlight, object, and paper. They draw straight light paths from source to object to shadow, then test with a partner. Revise drawings based on real observations.

20 min·Individual

Real-World Connections

• Stagehands and lighting designers use principles of light and shadow to create dramatic effects and set the mood for theatrical performances.
• Architects and urban planners consider how sunlight and shadows fall on buildings and public spaces throughout the day to optimize natural light and reduce heat gain.
• Animators use shadow puppetry techniques to create unique visual styles for films and short videos, often incorporating simple light sources and cut-out figures.

Assessment Ideas

Quick Check

Provide students with a flashlight and various opaque objects. Ask them to hold the object at different distances from the flashlight and draw what they observe. Prompt: 'How did the distance change the shadow?'

Discussion Prompt

Gather students in a circle with a single light source. Ask one student to hold an object and another to move the light source. Prompt: 'What happens to the shadow when the light moves closer? Further away? What happens if you move the object closer to the light?'

Exit Ticket

Give each student a piece of paper with a drawing of a sun and a tree. Ask them to draw the shadow of the tree at two different times of day (morning and afternoon). Prompt: 'Explain why the shadow is different in each drawing.'

Frequently Asked Questions

How do shadows form in grade 1 science?

Shadows form when opaque objects block straight-traveling light from reaching a surface. Grade 1 students use flashlights and toys to see light paths interrupted. They record how closer lights make bigger shadows, connecting daily sun observations to experiments for deeper understanding.

What activities teach light and shadows Ontario grade 1?

Try shadow stations, puppet designs, and body hunts. Students predict changes by moving flashlights, test ideas, and share results. These align with Ontario curriculum expectations for light energy inquiry, building observation and prediction skills through play.

Common misconceptions about light and shadows for kids?

Children often think shadows match object size exactly or that light bends. Address with hands-on demos: vary distances to show size shifts, draw straight paths to prove linearity. Peer talks refine ideas as students confront evidence together.

How does active learning help teach light and shadows?

Active learning engages Grade 1 students by letting them manipulate flashlights and objects, making invisible light paths visible through shadows. Prediction-test-revise cycles in pairs or groups correct misconceptions instantly. This kinesthetic approach boosts retention, as children remember concepts tied to their own successful experiments and creative puppet plays.