TalentJR apps
You need: a plastic comb, dry hair, tiny bits of paper and a balloon. What happens: after combing dry hair, the comb picks up the paper bits; a rubbed balloon sticks to a wall and bends a thin stream of tap water. Why: rubbing moves tiny electric charges onto the comb — static electricity — and the charge pulls light things towards it. It works best on dry days, because damp air lets the charge leak away. Lightning is a giant static spark.
✓ You passed this lesson’s test.
Rub and charge — “rubbing moves tiny charges; the charged comb pulls light things”
Use it for: Class 6–8 lessons on electricity and charges; a quick science trick for kids on a dry winter day.
Check: A wet comb hardly works — the charge leaks away ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the ⚡ Static Spark Spotter badge when you pass — and a certificate when you finish all 10 lessons of Part 3 · Physics and STEM projects. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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