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Electricity, Magnetism, Light & Sound

Grade 3 · On-level practice · 8 questions · Version PG-17XBPYX-JMEH

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1.Name a good electrical conductor.
2.Why does a shadow form?
3.How do you see an object?
4.What energy change occurs in a speaker?
5.What do like magnetic poles do?
6.What do opposite magnetic poles do?
7.Why can you hear an echo?
8.What can happen when light enters water?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 3
  1. Name a good electrical conductor.Copper
  2. Why does a shadow form?An object blocks light
  3. How do you see an object?Reflected light enters your eyes
  4. What energy change occurs in a speaker?Electrical energy becomes sound
  5. What do like magnetic poles do?Repel
  6. What do opposite magnetic poles do?Attract
  7. Why can you hear an echo?Sound reflects from a surface
  8. What can happen when light enters water?It refracts, or bends

Worked example

Use a model to track energy, forces, and waves through a system.

Common mistake

Assuming energy travels without a path or medium.

Helpful hint

Draw the source, path, interaction, and result.