I would start by engaging the students with a hands-on activity. I would begin by discussing what the sun is and how it provides us with light and warmth. I would then introduce the concept of shadows by asking the students to stand in the sunlight and observe how their bodies cast a shadow on the ground.
Next, I would lead the students in a simple experiment where we use a flashlight to create shadows on a blank wall. I would ask the students to take turns moving closer and farther away from the wall to see how the size and shape of their shadows change. This would help them understand that shadows are created when an object blocks the light from the sun or a light source.
After the experiment, we would discuss how shadows can change throughout the day as the position of the sun in the sky changes. We would also talk about how different objects can create different types of shadows, such as tall objects creating long shadows and round objects creating round shadows.
To reinforce the concept, I would provide the students with materials to create their own shadow puppets. They could use these puppets to create shadow plays and experiment with how moving the puppets closer to or farther away from the light changes the size and shape of their shadows.
I would conclude the lesson by reviewing what we have learned about the sun and shadows, reinforcing the idea that shadows are created when light is blocked by an object. The students would leave the lesson with a better understanding of how shadows are formed and how they can change throughout the day.