Simple Pendulum Experiment Worksheet

Science experiments lesson 23: Simple pendulum timing · Set 399 · 40 questions

What you do (Only the length matters): 1. Tie the nut to the string and hang it from the taped pencil, 30 cm long. 2. Pull it a little to one side and let go — do not push. 3. Time 10 swings and divide by 10. 4. Change only the string length (60 cm), time 10 swings again, and stand back from the bob.

1. 1.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a pencil and tape (b) a magnet (c) a ruler (d) a stopwatch
2. 2.🔮 Predict: you make the string shorter. The swings get ___. (a) heavier (b) quicker (c) slower (d) stopped
3. 3.🕰️ A pendulum takes 3 seconds for one swing. How many swings does it make in 54 seconds?
4. 4.🧺 Do we need a mirror for the pendulum? (a) not needed (b) needed
5. 5.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is what we measure? (a) time for 10 swings (b) the string length (c) how far we pull it back (d) the weight of the bob
6. 6.🛟 What is a safe bob for a home pendulum? (a) a glass bottle (b) a small nut or washer (c) a heavy brick (d) a sharp tool
7. 7.🕰️ Does a heavier bob change the swing time? (a) no, hardly at all (b) yes, much slower (c) yes, much faster (d) it stops swinging
8. 8.🕰️ Which change makes a pendulum swing more slowly? (a) a longer string (b) a shorter string (c) a lighter bob (d) a heavier bob
9. 9.🛟 Why should you stand back from a swinging pendulum? (a) it is wet (b) it is hot (c) it is magnetic (d) the bob could hit you
10. 10.True or false: turmeric powder is not needed for the pendulum. (a) False (b) True
11. 11.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is kept the same? (a) how far we pull it back (b) time for 10 swings (c) the string length
12. 12.🧺 Which of these is needed for the pendulum? (a) a pencil and tape (b) turmeric powder (c) a battery cell (d) a magnet
13. 13.🧺 Do we need a heavy nut or washer for the pendulum? (a) needed (b) not needed
14. 14.True or false: a pencil and tape is needed for the pendulum. (a) True (b) False
15. 15.🧺 Which of these is not needed for the pendulum? (a) a magnet (b) a pencil and tape (c) a heavy nut or washer (d) a string
16. 16.🧺 Which of these is needed for the pendulum? (a) a mirror (b) yeast (c) a stopwatch (d) turmeric powder
17. 17.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the string length”? (a) we measure it (b) we change it (c) we keep it the same
18. 18.🕰️ A pendulum makes 15 swings in 45 seconds. How many seconds does one swing take?
19. 19.🕰️ A pendulum makes 5 swings in 5 seconds. How many seconds does one swing take?
20. 20.📘 What pulls the pendulum bob back down after each swing? (a) gravity (b) the string (c) the wind (d) magnetism
21. 21.True or false: a battery cell is not needed for the pendulum. (a) False (b) True
22. 22.True or false: a mirror is needed for the pendulum. (a) True (b) False
23. 23.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: how far we pull it back is kept the same. (a) False (b) True
24. 24.🔮 Predict: you make the string 4 times as long. How does the swing time change? (a) it halves (b) it stays the same (c) it becomes 4 times (d) it doubles
25. 25.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the same hook”? (a) we keep it the same (b) we change it (c) we measure it
26. 26.🕰️ Which old clock uses a pendulum to keep time? (a) a sundial (b) a digital watch (c) a grandfather clock (d) a phone
27. 27.🧺 Do we need a battery cell for the pendulum? (a) needed (b) not needed
28. 28.🧺 Which of these is not needed for the pendulum? (a) a balloon (b) a ruler (c) a stopwatch (d) a string
29. 29.🔮 A heavier child sits on the same park swing. What happens to the swing time? (a) about the same (b) much slower (c) it cannot swing (d) much faster
30. 30.True or false: a magnet is not needed for the pendulum. (a) False (b) True
31. 31.True or false: a ruler is not needed for the pendulum. (a) False (b) True
32. 32.🧺 Do we need a balloon for the pendulum? (a) not needed (b) needed
33. 33.🧺 Which of these is not needed for the pendulum? (a) a battery cell (b) a ruler (c) a heavy nut or washer (d) a string
34. 34.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the weight of the bob”? (a) we measure it (b) we change it (c) we keep it the same
35. 35.🧺 Do we need yeast for the pendulum? (a) needed (b) not needed
36. 36.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: the same hook is kept the same. (a) False (b) True
37. 37.🧺 Do we need a pencil and tape for the pendulum? (a) not needed (b) needed
38. 38.🧺 Do we need a string for the pendulum? (a) not needed (b) needed
39. 39.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a balloon (b) a string (c) a heavy nut or washer (d) a pencil and tape
40. 40.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a battery cell (b) a pencil and tape (c) a string (d) a stopwatch

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