Cambridge Primary (1-6). Stage 3. Science. Workbook - Unit 3: Light and shadows

Look at the objects below. Draw a line to match each object to the right shadow.

Look at these objects. Predict the shadow shape and draw it on the right.

Look at the objects. Has each shadow been drawn correctly? Write a tick (✓) or cross (✗) to say if the shadow is right or wrong. If the shadow is wrong, draw it correctly at the bottom. Complete the ladder and bicycle; the aeroplane is the worked example.

Here are four objects. Draw one shadow each object might make. Then draw a different shadow the object might make. Complete pencil, phone, scissors and cell (battery); the paper clip is a completed example.

At noon the Sun is high and Kamal has a very short shadow. Draw the Sun lower in the sky near the X at 4pm.

At noon the Sun is high and Kamal has a very short shadow. At 4pm the Sun is lower near X, to the right in the picture. Draw what Kamal’s shadow will look like at 4pm.

Marcus measured the size of a shadow as he moved it towards a light source. He recorded his results on the table below. Look at the table and answer the question.

| Test number | Distance from light source (cm) | Size of shadow (cm) |
|---|---|---|
| 1 | 50 | 6 |
| 2 | 40 | 14 |
| 3 | 30 | 25 |
| 4 | 20 | 34 |
| 5 | 10 | 42 |

For each test Marcus moved the object ____ cm closer to the light source.

Marcus measured the size of a shadow as he moved it towards a light source. He recorded his results on the table below. Look at the table and answer the question.

| Test number | Distance from light source (cm) | Size of shadow (cm) |
|---|---|---|
| 1 | 50 | 6 |
| 2 | 40 | 14 |
| 3 | 30 | 25 |
| 4 | 20 | 34 |
| 5 | 10 | 42 |

The shadow was biggest when the object was ____ cm from the light source.

Marcus measured the size of a shadow as he moved it towards a light source. He recorded his results on the table below. Look at the table and answer the question.

| Test number | Distance from light source (cm) | Size of shadow (cm) |
|---|---|---|
| 1 | 50 | 6 |
| 2 | 40 | 14 |
| 3 | 30 | 25 |
| 4 | 20 | 34 |
| 5 | 10 | 42 |

What is the pattern in the shadow size? Complete this sentence. As the object moved towards the light source the shadow ____.

Look at these pictures. Which items are made from transparent materials? Which are made from opaque materials? Under each picture write ‘transparent’ or ‘opaque’. The glass window is already labelled transparent. Classify the named material or part, not every part of the object.

All sunglasses are transparent but some are more opaque than others. Match the right glasses to the right environment.

Environments: reading indoors; outside on a bright day; sunny beach; very bright sunny winter day with snow on the ground.

Choices: dark sunglasses needed; slightly dark sunglasses needed; very dark sunglasses needed; no sunglasses needed.

The example matches reading indoors to no sunglasses needed.

What kind of eye protection do these people need? Use a tick (✓) or cross (✗) to answer each question in the table. The pictures show a visor for an astronaut, an underwater mask, swimming goggles, sunglasses in sunshine, and a child indoors. The visor row is given.

| Person | Needs eye protection? | Might get water in their eyes? | Sunlight is too bright? | Should protection be dark like sunglasses? |
|---|---|---|---|---|
| Visor | ✓ | ✗ | ✓ | ✓ |
| Mask | ___ | ___ | ___ | ___ |
| Goggles | ___ | ___ | ___ | ___ |
| Sunglasses | ___ | ___ | ___ | ___ |
| Indoors | ___ | ___ | ___ | ___ |

Here we can see sentences covered by four sheets. Two sheets are transparent, one is translucent and one is opaque. Join each word to the correct picture: transparent; translucent; opaque. The second sheet from the top is already matched to translucent in the book.

These children were asked ‘Why does the Emergency sign have translucent glass with a bright lamp behind it?’ They answered like this:

- Sofia: ‘It keeps the sign cool.’
- Marcus: ‘Because the glass might not break.’
- Zara: ‘Because the letters stick to it.’
- Arun: ‘It makes the sign bright but the bright lamp is kept out of our eyes.’

Which child is right? Why?

Translucent materials scatter light so that we cannot see things clearly through them. The dentist has a translucent window. It lets some light in but we cannot see clearly through the glass. Why has the dentist put translucent glass in her window?

Translucent materials scatter light so that we cannot see things clearly through them. This light on the ceiling is covered with a translucent shade. Why do people like to have these translucent shades on bright light bulbs?

Translucent materials scatter light so that we cannot see things clearly through them. Some people put translucent glass in their front door. Why do they do this?