Attracting and repelling

👩 Teacher’s Guide

🎯 Objective

Students will be able to:

Describe the key ideas of attracting and repelling
Use correct scientific language about charges and forces
Apply static electricity concepts to everyday situations and safety

📝 Teaching Notes

Key idea to emphasize: Static electricity happens when objects gain or lose electrons, becoming charged. Like charges repel and opposite charges attract.
Common misconception: Neutral objects have “no charges” (they have charges that balance overall).
Suggested teaching approach:
- Quick demos (balloon, paper bits) to make invisible forces visible
- Use diagrams to show charge separation and field direction
- Connect to real applications (printing, safety, electronics)

💬 Discussion Starter

Ask students:

Why can a charged object attract something neutral?
Where do you notice static electricity in daily life?
When can static electricity be helpful, and when is it dangerous?

🧒 Student Worksheet

Concept and Helping Material

Static electricity happens when objects gain or lose electrons, becoming charged. Like charges repel and opposite charges attract.

Vocabulary and Definitions

— Property that can be positive or negative
— Negatively charged particle
— Charge build-up that does not flow continuously
— Push away
— Pull toward

Hands-On Experiment or Activities

Activity 1: Charge and attraction
What You Need: balloon, wool cloth/hair, small paper bits.
What You Do: 1) Rub balloon on wool/hair, 2) bring it near paper bits, 3) observe attraction.
Think and Talk: What changed? What stayed the same?

Activity 2: Like charges repel
What You Need: two balloons, wool cloth/hair, string.
What You Do: Charge both balloons the same way and hang them close together.
Think and Talk: What changed? What stayed the same?

Practice Questions (QA)

A balloon rubbed on hair sticks to a wall. Why?
What happens when two negatively charged objects are brought close?
What is the sign of charge gained if an object gains electrons?
What is the sign of charge gained if an object loses electrons?
Why don’t objects normally attract strongly?
Why can an insulator hold static charge easily?
What is the purpose of the neutral object’s charge rearrangement near a charged object?
What particle moves during static electricity in solids?
Does rubbing create charge from nothing?
Why does dry air increase static effects?

Reflection

Where might static electricity be helpful in technology?
How could you reduce static shocks in winter?