Pulley STEM Project Worksheet

Science experiments lesson 25: Thread-reel pulley · Set 518 · 40 questions

What you do (Pull down, lift up): 1. Push the pencil through the thread reel; an adult holds the pencil ends level. 2. Tie the paper cup to one end of the string and lay the string over the reel. 3. Put coins in the cup and pull the other end down. 4. Feel how hard you pull; never stand under the load or wrap string round your fingers.

1. 1.🔮 With a moving pulley, to lift the cup 10 cm you must pull the string about ___. (a) 40 cm (b) 20 cm (c) 5 cm (d) 10 cm
2. 2.True or false: a mirror is not needed for the thread-reel pulley. (a) True (b) False
3. 3.True or false: a slide is a lever. (a) False (b) True
4. 4.True or false: turmeric powder is needed for the thread-reel pulley. (a) False (b) True
5. 5.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
6. 6.🔮 Predict: you add more coins to the cup. Pulling it up gets ___. (a) easier (b) harder (c) the same (d) impossible
7. 7.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the same cup of coins is the one thing we change. (a) True (b) False
8. 8.🧺 Which of these is not needed for the thread-reel pulley? (a) yeast (b) coins as the load (c) a pencil (d) string
9. 9.⚙️ Which of these uses a pulley? (a) a crowbar (b) a bottle opener (c) a tap handle (d) a flagpole
10. 10.True or false: a small paper cup is not needed for the thread-reel pulley. (a) False (b) True
11. 11.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “how hard we must pull”? (a) we measure it (b) we change it (c) we keep it the same
12. 12.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “the lifting height”? (a) we change it (b) we keep it the same (c) we measure it
13. 13.🧺 Do we need yeast for the thread-reel pulley? (a) not needed (b) needed
14. 14.⚙️ Which simple machine is a bottle opener? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
15. 15.🧺 Do we need string for the thread-reel pulley? (a) not needed (b) needed
16. 16.True or false: a pencil is needed for the thread-reel pulley. (a) True (b) False
17. 17.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a spoon lifting a lid (c) a slide (d) a steering wheel
18. 18.🧺 Do we need a pencil for the thread-reel pulley? (a) not needed (b) needed
19. 19.🔮 Predict: you add a moving pulley that holds the cup. The pull needed becomes ___. (a) zero (b) the same (c) about half (d) double
20. 20.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a small paper cup (b) a pencil (c) turmeric powder (d) coins as the load
21. 21.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the same string is kept the same. (a) False (b) True
22. 22.🧺 Do we need an empty thread reel for the thread-reel pulley? (a) not needed (b) needed
23. 23.🧺 Do we need a battery cell for the thread-reel pulley? (a) needed (b) not needed
24. 24.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “the same cup of coins”? (a) we keep it the same (b) we measure it (c) we change it
25. 25.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is the one thing we change? (a) number of pulleys (b) the same string (c) the lifting height (d) how hard we must pull
26. 26.🏗️ Why is a pulley used to lift water from a deep well? (a) pulling down is easier (b) the rope gets shorter (c) the bucket floats (d) water gets lighter
27. 27.True or false: a magnet is needed for the thread-reel pulley. (a) False (b) True
28. 28.🧺 Which of these is needed for the thread-reel pulley? (a) a magnet (b) a pencil (c) a battery cell (d) a mirror
29. 29.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
30. 30.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) coins as the load (b) a small paper cup (c) a balloon (d) a pencil
31. 31.🧺 Do we need a small paper cup for the thread-reel pulley? (a) not needed (b) needed
32. 32.🏗️ With one fixed pulley, which way do you pull the string to lift the cup? (a) down (b) up (c) sideways (d) in a circle
33. 33.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) an empty thread reel (b) a small paper cup (c) a magnet (d) a pencil
34. 34.🧺 Which of these is needed for the thread-reel pulley? (a) yeast (b) a battery cell (c) a magnet (d) an empty thread reel
35. 35.⚙️ Which simple machine is a slide? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
36. 36.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the same string is what we measure. (a) False (b) True
37. 37.True or false: a doorknob uses a pulley. (a) False (b) True
38. 38.🛟 Why should you not wrap the string around your finger? (a) it gets longer (b) it turns blue (c) it can hurt your finger (d) it gets wet
39. 39.True or false: a balloon is not needed for the thread-reel pulley. (a) True (b) False
40. 40.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: how hard we must pull is what we measure. (a) False (b) True

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