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

The Sun: Our Main Energy Source

Students will identify the sun as the primary source of light and heat for Earth through inquiry and concept mapping.

• Ontario Curriculum Expectations
• K-PS3-1

About This Topic

The Sun's Heat and Light introduces students to the sun as our primary source of energy. Students explore how the sun provides the light we need to see and the heat that keeps our planet habitable. In the Ontario curriculum, this topic connects to daily and seasonal changes, as well as the needs of living things. It also offers a chance to discuss how different cultures, including Indigenous peoples and diverse immigrant communities, have historically tracked and celebrated the sun's path.

Students investigate how different surfaces absorb heat and how shadows are formed. This topic is ideal for outdoor learning, where students can feel the sun's warmth and observe its effects in real-time. Students grasp this concept faster through structured experimentation where they can compare temperatures in the sun and shade.

Key Questions

1. Explain how the sun provides energy for plants and animals.
2. Predict what would happen to Earth if the sun's energy disappeared.
3. Analyze how the sun's energy affects daily life on Earth.

Learning Objectives

• Identify the sun as the primary source of light and heat for Earth.
• Explain how the sun's energy supports plant growth and provides warmth for animals.
• Analyze how the sun's energy influences daily activities and the environment.
• Predict the immediate effects on Earth if the sun's energy were to cease.

Before You Start

Needs of Living Things

Why: Students need to know that plants and animals require certain things to survive, which helps them understand the sun's role in providing those needs.

Basic Observation Skills

Why: This topic relies on students' ability to observe and describe phenomena like light and warmth.

Key Vocabulary

Sun	The star at the center of our solar system that provides light and heat to Earth.
Energy	The ability to do work; for Earth, the sun's energy comes as light and heat.
Light	Electromagnetic radiation that allows us to see and helps plants grow.
Heat	A form of energy that makes things warm; the sun's heat keeps Earth at a temperature suitable for life.
Photosynthesis	The process plants use to convert light energy from the sun into food.

Watch Out for These Misconceptions

Common Misconception

The sun is only 'working' when it is hot outside.

What to Teach Instead

Students often associate the sun only with summer. Active observations on a cold but sunny winter day help students realize that the sun provides light and some heat year-round, even if the air temperature is low.

Common Misconception

The sun moves across the sky.

What to Teach Instead

While it looks that way, it's actually the Earth rotating. While Grade 1s don't need complex orbital mechanics, using a 'human globe' simulation where a student spins in front of a 'sun' flashlight helps introduce the correct concept.

Active Learning Ideas

Inquiry Circle: The Melting Race

Groups place ice cubes in different spots: direct sunlight, under a tree's shade, and wrapped in a cloth. They predict which will melt first and observe the results to understand the sun's heat energy.

40 min·Small Groups

Simulation Game: Solar Oven Snacks

Using a pizza box and foil, the class works together to build a simple solar oven. They place a piece of chocolate inside and watch it melt, demonstrating how we can use the sun's energy for heat.

60 min·Whole Class

Think-Pair-Share: Sun Safety

Show images of a sunny beach and a snowy day. Pairs discuss why we need sun protection (hats, sunscreen) in both scenarios, helping them realize the sun's energy is present even when it's cold.

15 min·Pairs

Real-World Connections

• Farmers rely on sunlight for their crops to grow. They observe the sun's position to understand seasonal changes and plan planting and harvesting times.
• Solar-powered devices, like calculators and some streetlights, use energy directly from the sun to function without electricity from a grid.
• Architects and builders consider the sun's path when designing buildings to maximize natural light and warmth in winter, and minimize overheating in summer.

Assessment Ideas

Exit Ticket

Give students a drawing of the sun and Earth. Ask them to draw two arrows showing how the sun's energy reaches Earth and write one sentence explaining what that energy does for us.

Discussion Prompt

Pose the question: 'What would happen to our playground if the sun disappeared for one day?' Ask students to share their ideas about light, heat, and what plants and animals might do.

Quick Check

Show students pictures of different scenarios (e.g., a plant growing, a person feeling warm, a dark room, a cold winter day). Ask students to point to the pictures that show the sun's energy at work and explain why.

Frequently Asked Questions

What are the best hands-on strategies for teaching about the sun?

Outdoor 'shadow tracking' and temperature comparisons are excellent. By marking the position of a shadow at 9:00 AM and again at 1:00 PM, students see the sun's 'movement' and energy changes. Using infrared thermometers (if available) to scan the sidewalk versus the grass provides instant, exciting data about heat absorption.

How can I safely observe the sun with Grade 1 students?

Never have students look directly at the sun. Instead, focus on the sun's *effects*, shadows, warmth on the skin, and the way it lights up the room. Use solar paper or shadow drawings as safe ways to 'interact' with sunlight.

How does this topic relate to Indigenous knowledge?

Many Indigenous cultures view the Sun as a grandfather or a powerful life-giver. Discuss how the sun's position was used to tell time or signal the change of seasons for planting and harvesting, showing the sun's role as a vital guide.

Why is it important to teach about the sun's energy in Grade 1?

It sets the stage for understanding all other forms of energy. By realizing that the sun provides the light for plants to grow and the heat for our weather, students begin to see the sun as the 'engine' behind almost everything on Earth.

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