Pulley
Rope and wheel — flag pole and well.
Pulley
Pulley
What you'll learn
- A pulley is a wheel with a groove and a rope.
- Changes direction of force — pull down to lift up.
- Examples: flag pole, well (ghari), clothes line.
- Observe pulleys in school flag ceremony — Looking Around 3.
Key concepts
Level 1 — Core idea
Verbal: Pull rope down on a flag pole — the flag goes up.
Symbolic: Rope over wheel: effort down → load up.
Visual: Circle (wheel) at top; rope loops over; bucket on one end.
Level 2 — Going deeper
Fixed pulley mainly changes direction. (Movable pulleys reduce effort — preview for higher classes.)
NCERT anchor
NCERT Looking Around 3 village well and flag-raising stories show pulleys. Watch rope direction vs bucket direction.
Worked example
Why pull down to raise a flag?
Step 1 — Rope over pulley wheel at top
Step 2 — Pulling down on one side lifts flag on other
Step 3 — Pulley **redirects** force ✓
Well pulley — what moves when you pull?
Step 1 — Pull rope → bucket of water rises
Step 2 — Wheel turns; rope slides in groove
Answer: **Bucket (load)** moves up; you pull down
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Pulley is same as lever | Simple machine mix | Pulley uses wheel + rope |
| No wheel needed | Rope alone myth | Need grooved wheel |
| Pull up to lift up always | Direction unchanged idea | Fixed pulley often pull down |
| Pulley makes load weightless | Effort zero myth | Easier direction, not zero weight |
Quick check
- What two parts make a pulley?
- Name one pulley use.
- Pull rope which way to lift bucket?
- Stretch: Why is a well pulley wheel at the top, not bottom?
Revision tip: Trace rope path with finger on a diagram — follow effort to load.
Open the Practice tab for graded questions on Pulley.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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