Light And Shadow - Free Printable

Problem Analysis:

The task requires filling in the missing words in a science worksheet about light and shadows. The worksheet provides clues and a diagram to help solve the problem. Let's break it down step by step.

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Worksheet Content:

#### Section 1: Light and Shadow
1. Light travels in _______ lines from a _______ of light that bounces off an object. We can see the object because the _______ enters our eyes.
- Clues:
- Light travels in straight lines.
- A "source" is where light originates.
- Light enters our eyes for us to see objects.

2. Wood and cardboard are _______ materials that light cannot travel through. _______ is a _______ material which allows light to pass through. Tissue paper is _______ which will let some light through.
- Clues:
- Wood and cardboard do not allow light to pass through, so they are opaque.
- Glass is a material that allows light to pass through completely, so it is transparent.
- Tissue paper lets some light through but not all, so it is translucent.

3. When an object blocks out the _______, a _______ is formed. Shadows are _______ at midday and _______ at the beginning and end of the day.
- Clues:
- When light is blocked, a shadow is formed.
- At midday, the sun is high, so shadows are shortest.
- At the beginning and end of the day, the sun is low, so shadows are longest.

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Solution:

Using the clues and logical reasoning, we can fill in the blanks as follows:

#### Section 1: Light and Shadow
1. Light travels in straight lines from a source of light that bounces off an object. We can see the object because the light enters our eyes.
- Explanation: Light travels in straight lines (as shown in the diagram), and the source is where the light originates. Light entering our eyes allows us to see objects.

2. Wood and cardboard are opaque materials that light cannot travel through. Glass is a transparent material which allows light to pass through. Tissue paper is translucent which will let some light through.
- Explanation: Opaque materials block light entirely, transparent materials allow light to pass through completely, and translucent materials allow some light to pass through but scatter it.

3. When an object blocks out the light, a shadow is formed. Shadows are shortest at midday and longest at the beginning and end of the day.
- Explanation: Shadows are formed when light is blocked. At midday, the sun is high, creating short shadows. At the beginning and end of the day, the sun is low, creating long shadows.

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Final Answer:

\[
\boxed{
\text{straight, source, light, opaque, glass, transparent, translucent, light, shadow, shortest, longest}
}
\]

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Explanation of the Diagram:

- The diagram shows how different materials affect light:
- Opaque materials (e.g., wood, cardboard) block light completely, resulting in a dark shadow.
- Transparent materials (e.g., glass) allow light to pass through without scattering.
- Translucent materials (e.g., tissue paper) allow some light to pass through but scatter it, creating a softer shadow.

This completes the worksheet with clear reasoning for each answer.