Holywell Primary and Nursery School

Me and My Shadow

Sometimes objects can block light which means that no light is able to pass through that object. An object from which no light can pass through is called an opaque object. The easiest example is our body. Stand in the way of a beam of a light from a small torch. Ask someone to stand behind you and spot the beam of light. The person behind you will see no light since your body did not allow it to pass. Whenever light is not able to go through an object, it creates a dark area around the object. This patch where the light can not reach is called a shadow. Opaque objects create clear dark shadows.

The size of the shadow depends on the angle at which the light is falling on the object. Your shadow keeps changing throughout the day. It is longest in the early morning and the late afternoon? At noon, when the sun is overhead there is little or no shadow at all. Why? The position of sun changes throughout the day, thus changing the angle at which the rays fall on the ground. A long time ago people tracked the length of shadows throughout the day to keep track of time. The world’s earliest clock was a sun clock.

 

From 9am to 3am 5MH measured the position of a meter ruler’s shadow from a fixed point.  After chalking out each point every hour, we joined the points up. We noticed that we had created the letter ‘U’ shape. On analysis, this confirmed that  shadows are longest in the early morning and the late afternoon? At midday, when the sun is overhead there is little or no shadow at all.

Another scientific question answered by the science team.