Pulley STEM Project Worksheet

Science experiments lesson 25: Thread-reel pulley · Set 51 · 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.🔮 Predict: you add a moving pulley that holds the cup. The pull needed becomes ___. (a) about half (b) double (c) the same (d) zero
2. 2.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a slide (d) a bottle opener
3. 3.True or false: string is needed for the thread-reel pulley. (a) True (b) False
4. 4.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is what we measure? (a) the lifting height (b) how hard we must pull (c) the same cup of coins (d) the same string
5. 5.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a pencil (b) an empty thread reel (c) a magnet (d) string
6. 6.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a mirror (b) string (c) a pencil (d) coins as the load
7. 7.🛟 Why should you never stand under a load being lifted? (a) it could fall on you (b) it is magnetic (c) it might sing (d) it gets hot
8. 8.True or false: a ramp is an inclined plane. (a) False (b) True
9. 9.🧺 Do we need coins as the load for the thread-reel pulley? (a) not needed (b) needed
10. 10.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a doorknob (c) a flagpole (d) a crane
11. 11.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
12. 12.True or false: a pencil is not needed for the thread-reel pulley. (a) False (b) True
13. 13.True or false: a mirror is not needed for the thread-reel pulley. (a) False (b) True
14. 14.True or false: a sloping road is a lever. (a) False (b) True
15. 15.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is kept the same? (a) number of pulleys (b) the same string (c) how hard we must pull
16. 16.🧺 Do we need an empty thread reel for the thread-reel pulley? (a) not needed (b) needed
17. 17.🧺 Which of these is not needed for the thread-reel pulley? (a) a small paper cup (b) a magnet (c) string (d) coins as the load
18. 18.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) yeast (b) an empty thread reel (c) string (d) coins as the load
19. 19.🔮 With a moving pulley, to lift the cup 10 cm you must pull the string about ___. (a) 40 cm (b) 20 cm (c) 10 cm (d) 5 cm
20. 20.🏗️ Why is a pulley used to lift water from a deep well? (a) the rope gets shorter (b) pulling down is easier (c) water gets lighter (d) the bucket floats
21. 21.🧺 Which of these is needed for the thread-reel pulley? (a) a battery cell (b) a pencil (c) a mirror (d) a balloon
22. 22.📘 A pulley is a wheel with a groove for a ___. (a) rope (b) nail (c) battery (d) magnet
23. 23.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a pencil (b) string (c) an empty thread reel (d) a balloon
24. 24.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the lifting height is what we measure. (a) True (b) False
25. 25.⚖️ 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
26. 26.True or false: a magnet is not needed for the thread-reel pulley. (a) True (b) False
27. 27.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the same string is the one thing we change. (a) False (b) True
28. 28.⚖️ 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) True (b) False
29. 29.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: number of pulleys is kept the same. (a) False (b) True
30. 30.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “number of pulleys”? (a) we change it (b) we measure it (c) we keep it the same
31. 31.🧺 Which of these is not needed for the thread-reel pulley? (a) an empty thread reel (b) a pencil (c) a mirror (d) coins as the load
32. 32.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “the lifting height”? (a) we measure it (b) we change it (c) we keep it the same
33. 33.🧺 Which of these is needed for the thread-reel pulley? (a) a magnet (b) string (c) a mirror (d) a battery cell
34. 34.🧺 Do we need a small paper cup for the thread-reel pulley? (a) needed (b) not needed
35. 35.🧺 Do we need turmeric powder for the thread-reel pulley? (a) needed (b) not needed
36. 36.True or false: an empty thread reel is not needed for the thread-reel pulley. (a) False (b) True
37. 37.True or false: a mirror is needed for the thread-reel pulley. (a) True (b) False
38. 38.🧺 Which of these is needed for the thread-reel pulley? (a) a mirror (b) yeast (c) a small paper cup (d) a balloon
39. 39.🔮 Predict: you add more coins to the cup. Pulling it up gets ___. (a) impossible (b) easier (c) the same (d) harder
40. 40.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: how hard we must pull is the one thing we change. (a) False (b) True

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