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A fixed pulley stays in one place and only changes the direction of your pull — you pull down to lift the load up, with the same force. A movable pulley rides up with the load; two rope sections share the load, so you need half the effort but pull twice as much rope. With ideal pulleys, effort = load ÷ number of rope sections holding the load. A wheel and axle (a well winch, a doorknob, a steering wheel) has MA = wheel radius ÷ axle radius.
✓ You passed this lesson’s test.
Count the ropes — “effort = load ÷ rope sections holding the load (ideal pulleys)”
Use it for: Science lessons on pulleys, a flagpole or well at school, and building a model crane.
Check: 3 × 200 N = 600 N, but you pull 3 m of rope to lift it 1 m ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
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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 🪝 Pulley Pro Engineer badge when you pass — and a certificate when you finish all 8 lessons of Part 2 · Forces and machines. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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