Have you ever seen a crane lift a giant block, or pulled a flag up a pole? They use a clever little machine called a pulley!
A pulley turns a hard pull into an easy pull. 💪➡️🙂
Tap Next and let's find out how it works!
A pulley is just a wheel with a groove and a rope that runs around it. Tap each part to learn its job!
A pulley fixed to the top lets you pull DOWN to make the box go UP. Pulling down is easier — you can use your own body weight!
Here is the magic! Add a second wheel that moves with the box. Now two ropes hold the weight, so each rope only carries half. You pull half as hard! 🎉
A box weighs 100. How hard do you pull with this 2-wheel pulley?
Add even more wheels and ropes — this is called a block and tackle. The more ropes share the weight, the easier it gets. Drag the slider to add wheels!
🛞 Wheels (ropes): 1
Goal: slide it to make the pull as easy as possible. 💪
Pulleys are everywhere in Singapore. Tap the things that use a pulley. Watch out — one of them does not!
You now know how pulleys lift heavy things:
Next time you raise a flag, you'll know the secret! 🎉