Pulley STEM Project Worksheet

Science experiments lesson 25: Thread-reel pulley · Set 665 · 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.🛟 Why should you not wrap the string around your finger? (a) it can hurt your finger (b) it gets wet (c) it turns blue (d) it gets longer
2. 2.🧺 Do we need a pencil for the thread-reel pulley? (a) not needed (b) needed
3. 3.⚖️ 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
4. 4.🧺 Do we need a mirror for the thread-reel pulley? (a) not needed (b) needed
5. 5.🔮 With a moving pulley, to lift the cup 10 cm you must pull the string about ___. (a) 10 cm (b) 5 cm (c) 20 cm (d) 40 cm
6. 6.True or false: an empty thread reel is not needed for the thread-reel pulley. (a) True (b) False
7. 7.True or false: coins as the load is needed for the thread-reel pulley. (a) True (b) False
8. 8.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is the one thing we change? (a) the lifting height (b) how hard we must pull (c) the same string (d) number of pulleys
9. 9.🧺 Which of these is not needed for the thread-reel pulley? (a) a small paper cup (b) coins as the load (c) a battery cell (d) a pencil
10. 10.🧺 Which of these is needed for the thread-reel pulley? (a) a mirror (b) turmeric powder (c) string (d) a balloon
11. 11.🧺 Which of these is not needed for the thread-reel pulley? (a) string (b) a small paper cup (c) a balloon (d) an empty thread reel
12. 12.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) an empty thread reel (b) a pencil (c) a battery cell (d) coins as the load
13. 13.🧺 Which of these is needed for the thread-reel pulley? (a) a mirror (b) a balloon (c) a battery cell (d) a pencil
14. 14.True or false: a battery cell is not needed for the thread-reel pulley. (a) True (b) False
15. 15.True or false: a pencil is not needed for the thread-reel pulley. (a) True (b) False
16. 16.True or false: an empty thread reel is needed for the thread-reel pulley. (a) True (b) False
17. 17.🧺 Do we need a battery cell for the thread-reel pulley? (a) needed (b) not needed
18. 18.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) coins as the load (b) string (c) a mirror (d) a small paper cup
19. 19.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) an empty thread reel (b) a pencil (c) coins as the load (d) a magnet
20. 20.🔮 Predict: you add a moving pulley that holds the cup. The pull needed becomes ___. (a) the same (b) double (c) about half (d) zero
21. 21.🔮 Predict: you add more coins to the cup. Pulling it up gets ___. (a) the same (b) impossible (c) easier (d) harder
22. 22.🛟 Why should you never stand under a load being lifted? (a) it might sing (b) it gets hot (c) it is magnetic (d) it could fall on you
23. 23.🏗️ With one fixed pulley, which way do you pull the string to lift the cup? (a) sideways (b) up (c) in a circle (d) down
24. 24.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “the lifting height”? (a) we keep it the same (b) we change it (c) we measure it
25. 25.⚖️ 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
26. 26.🏗️ Why is a pulley used to lift water from a deep well? (a) water gets lighter (b) the rope gets shorter (c) the bucket floats (d) pulling down is easier
27. 27.True or false: a doorknob is a lever. (a) False (b) True
28. 28.⚖️ 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) the same string (c) the same cup of coins (d) how hard we must pull
29. 29.🧺 Which of these is not needed for the thread-reel pulley? (a) an empty thread reel (b) a small paper cup (c) a magnet (d) coins as the load
30. 30.True or false: a well pulley is a wheel and axle. (a) False (b) True
31. 31.🧺 Which of these is needed for the thread-reel pulley? (a) a balloon (b) a battery cell (c) an empty thread reel (d) a magnet
32. 32.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is kept the same? (a) the lifting height (b) how hard we must pull (c) number of pulleys
33. 33.True or false: coins as the load is not needed for the thread-reel pulley. (a) False (b) True
34. 34.⚖️ 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 measure it (b) we change it (c) we keep it the same
35. 35.⚙️ Which of these uses a pulley? (a) a doorknob (b) a well pulley (c) a slide (d) a ramp
36. 36.🧺 Do we need a balloon for the thread-reel pulley? (a) needed (b) not needed
37. 37.True or false: yeast is needed for the thread-reel pulley. (a) True (b) False
38. 38.⚖️ 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 keep it the same (c) we measure it
39. 39.🏗️ What does a single fixed pulley mainly do? (a) halves the weight (b) adds weight (c) makes it magnetic (d) changes pull direction
40. 40.🧺 Which of these is not needed for the thread-reel pulley? (a) an empty thread reel (b) a pencil (c) string (d) yeast

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