Pulley STEM Project Worksheet

Science experiments lesson 25: Thread-reel pulley · Set 380 · 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.True or false: a bottle opener is a lever. (a) True (b) False
2. 2.🧺 Do we need a mirror for the thread-reel pulley? (a) not needed (b) needed
3. 3.🧺 Do we need yeast for the thread-reel pulley? (a) not needed (b) needed
4. 4.🔮 Predict: you add a moving pulley that holds the cup. The pull needed becomes ___. (a) zero (b) about half (c) double (d) the same
5. 5.True or false: a flagpole is a lever. (a) True (b) False
6. 6.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
7. 7.🧺 Do we need string for the thread-reel pulley? (a) needed (b) not needed
8. 8.🛟 Why should you not wrap the string around your finger? (a) it gets wet (b) it can hurt your finger (c) it gets longer (d) it turns blue
9. 9.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
10. 10.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
11. 11.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) string (b) yeast (c) an empty thread reel (d) a pencil
12. 12.🧺 Which of these is needed for the thread-reel pulley? (a) turmeric powder (b) an empty thread reel (c) yeast (d) a magnet
13. 13.⚖️ Fair test — is lifting the cup easier with one pulley or with two? What do we do with “the same string”? (a) we measure it (b) we change it (c) we keep it the same
14. 14.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) string (b) a small paper cup (c) an empty thread reel (d) a battery cell
15. 15.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is the one thing we change? (a) the same string (b) the same cup of coins (c) the lifting height (d) number of pulleys
16. 16.🧺 Which of these is not needed for the thread-reel pulley? (a) an empty thread reel (b) a balloon (c) coins as the load (d) a small paper cup
17. 17.⚖️ 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
18. 18.🧺 Which of these is needed for the thread-reel pulley? (a) a balloon (b) a magnet (c) a mirror (d) a small paper cup
19. 19.🛟 Why should you never stand under a load being lifted? (a) it gets hot (b) it is magnetic (c) it might sing (d) it could fall on you
20. 20.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) an empty thread reel (b) a magnet (c) a small paper cup (d) string
21. 21.🧺 Do we need an empty thread reel for the thread-reel pulley? (a) needed (b) not needed
22. 22.🧺 Which of these is needed for the thread-reel pulley? (a) a battery cell (b) string (c) a magnet (d) yeast
23. 23.True or false: a magnet is needed for the thread-reel pulley. (a) True (b) False
24. 24.🧺 Which of these is needed for the thread-reel pulley? (a) a balloon (b) turmeric powder (c) coins as the load (d) a battery cell
25. 25.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a small paper cup (b) string (c) turmeric powder (d) a pencil
26. 26.True or false: a crane uses a pulley. (a) False (b) True
27. 27.⚖️ 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 keep it the same (c) we change it
28. 28.True or false: a doorknob is a lever. (a) True (b) False
29. 29.True or false: a mirror is needed for the thread-reel pulley. (a) False (b) True
30. 30.🔮 Predict: you add more coins to the cup. Pulling it up gets ___. (a) impossible (b) harder (c) the same (d) easier
31. 31.True or false: a slide is an inclined plane. (a) False (b) True
32. 32.🧺 Three of these are needed for the thread-reel pulley. Which one is NOT needed? (a) a small paper cup (b) an empty thread reel (c) a balloon (d) coins as the load
33. 33.🔮 With a moving pulley, to lift the cup 10 cm you must pull the string about ___. (a) 10 cm (b) 20 cm (c) 40 cm (d) 5 cm
34. 34.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: number of pulleys is the one thing we change. (a) False (b) True
35. 35.True or false: coins as the load is needed for the thread-reel pulley. (a) False (b) True
36. 36.⚖️ Fair test — is lifting the cup easier with one pulley or with two? True or false: the lifting height is kept the same. (a) False (b) True
37. 37.⚖️ 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) how hard we must pull (c) the same string
38. 38.True or false: a balloon is needed for the thread-reel pulley. (a) False (b) True
39. 39.🏗️ What does a single fixed pulley mainly do? (a) adds weight (b) makes it magnetic (c) changes pull direction (d) halves the weight
40. 40.⚖️ 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

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