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shadow
The object blocks some light.
Class 3 · English Medium · Cambridge · General science
Light, shadows and sound
Explore light, shadows and sound with an example and your own answers.
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
An opaque object blocks light and can form a shadow. Sound is produced by vibrations and needs a material medium to travel.
Worked example
A card between a torch and a wall blocks some light. A drum skin vibrates when struck gently.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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skin
The stretched drum skin vibrates.
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no
Sound needs matter, such as air, to carry vibrations.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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opaque
Opaque material does not transmit visible light.
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vibration
The skin moves back and forth.
Write in your own words. A guardian or teacher should review this response.
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The blocked region depends on the positions of the source, object and surface, so moving one can change the shadow.
Use a labelled paper sketch; never look at the Sun.
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