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Year 3 - Science

Shadow size: do

Introduction to light and shadows

Unit Summary

This unit explores the nature of light, recognising that light is needed to see and that dark is the absence of light. It covers how light reflects and shadow formation. The unit emphasises practical tests, observations, accurate measuring, and using evidence to support findings.

Lesson Summary

You will learn to measure and record information about shadow size.

Key Notes

  • The size of a shadow changes depending on the distance of an object from the light source.
  • Height and distance can be measured using a ruler or tape measure.
  • The results of an investigation can be recorded in a table.
  • A table of results needs headings for each column. This helps other people to understand the information.

Vocabulary To Learn

  • shadow: A shadow is a dark shape that is formed when an object blocks a source of light.
  • light source: Something that is a light source produces its own light.
  • distance: Distance is how far away something is or how far an object has travelled.
  • measure: To measure is to use equipment to find numbers to describe a feature of something such as its length, weight, size or time.
  • table: A table is a grid in which information can be recorded and stored.

Common Mistakes To Avoid

  • The size of a shadow does not change.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

The size of a shadow changes depending on the distance of an object from the light source. Height and distance can be measured using a ruler or tape measure.

2. Define this scientific word and use it in context. 'shadow'

A shadow is a dark shape that is formed when an object blocks a source of light. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: The size of a shadow does not change. Correction: Explanation of how the size of shadows change depending on the distance of the object from the light source.

More Lessons In This Unit

Browse all guides in the Year 3 Science guide library.