How is a shadow formed and why does it change shape? - Presentation

Shadows are a natural phenomenon that occur when an object blocks light, causing a dark silhouette to appear on the surface opposite the light source. To explore this concept, students are encouraged to conduct experiments to observe when shadows are longer or shorter. By setting up simple tests throughout the day, they can record and analyse the length of shadows cast by sunlight at different times. Diagrams are used to aid their understanding and to visually represent their findings. The purpose of these experiments is to help students grasp the reasons behind the changing lengths of shadows, which they will then explain in their write-ups, supported by the diagrams they have created.

The creation and manipulation of shadows can also be a fun and educational activity. Students are prompted to experiment with hand shadows by casting their hands' silhouettes onto a wall using a light source. This exercise not only engages their creativity but also demonstrates how the shape and orientation of an object relative to the light source can alter the shape of the shadow. Partners are tasked with photographing each other's hand shadow attempts, providing a visual record of their most successful ideas. Through these activities, students learn about the interplay between light and dark and its impact on everyday life, while also understanding the factors that cause shadows to change shape.