Simple Pendulum Experiment Worksheet

Science experiments lesson 23: Simple pendulum timing · Set 120 · 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.🕰️ A pendulum makes 10 swings in 30 seconds. How many seconds does one swing take?
2. 2.🔮 A heavier child sits on the same park swing. What happens to the swing time? (a) much slower (b) it cannot swing (c) much faster (d) about the same
3. 3.True or false: a heavy nut or washer is needed for the pendulum. (a) False (b) True
4. 4.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the string length”? (a) we change it (b) we measure it (c) we keep it the same
5. 5.True or false: a pencil and tape is not needed for the pendulum. (a) False (b) True
6. 6.🕰️ A pendulum makes 10 swings in 10 seconds. How many seconds does one swing take?
7. 7.True or false: a battery cell is needed for the pendulum. (a) True (b) False
8. 8.True or false: turmeric powder is needed for the pendulum. (a) True (b) False
9. 9.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a ruler (b) a pencil and tape (c) a heavy nut or washer (d) yeast
10. 10.🧺 Do we need a string for the pendulum? (a) needed (b) not needed
11. 11.🛟 What is a safe bob for a home pendulum? (a) a small nut or washer (b) a glass bottle (c) a heavy brick (d) a sharp tool
12. 12.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the weight of the bob”? (a) we change it (b) we keep it the same (c) we measure it
13. 13.🧺 Which of these is needed for the pendulum? (a) a battery cell (b) turmeric powder (c) a string (d) a magnet
14. 14.🧺 Which of these is not needed for the pendulum? (a) a string (b) a balloon (c) a heavy nut or washer (d) a pencil and tape
15. 15.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is the one thing we change? (a) how far we pull it back (b) the same hook (c) the weight of the bob (d) the string length
16. 16.🧺 Which of these is not needed for the pendulum? (a) a string (b) a pencil and tape (c) a battery cell (d) a ruler
17. 17.🔮 Predict: you make the string 4 times as long. How does the swing time change? (a) it becomes 4 times (b) it halves (c) it doubles (d) it stays the same
18. 18.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is kept the same? (a) time for 10 swings (b) the string length (c) the same hook
19. 19.🛟 Why should you stand back from a swinging pendulum? (a) it is magnetic (b) the bob could hit you (c) it is hot (d) it is wet
20. 20.📘 What pulls the pendulum bob back down after each swing? (a) magnetism (b) the string (c) gravity (d) the wind
21. 21.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is what we measure? (a) how far we pull it back (b) the weight of the bob (c) time for 10 swings (d) the string length
22. 22.🕰️ Why do we time 10 swings and divide, instead of timing just one? (a) it is more accurate (b) one swing is too slow (c) it is more fun (d) 10 is a lucky number
23. 23.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a heavy nut or washer (b) a string (c) a mirror (d) a stopwatch
24. 24.🕰️ Does a heavier bob change the swing time? (a) no, hardly at all (b) it stops swinging (c) yes, much faster (d) yes, much slower
25. 25.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a ruler (b) a pencil and tape (c) turmeric powder (d) a stopwatch
26. 26.🔮 Predict: you make the string shorter. The swings get ___. (a) quicker (b) slower (c) stopped (d) heavier
27. 27.🧺 Do we need a balloon for the pendulum? (a) not needed (b) needed
28. 28.🧺 Do we need a heavy nut or washer for the pendulum? (a) needed (b) not needed
29. 29.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the same hook”? (a) we change it (b) we keep it the same (c) we measure it
30. 30.True or false: a pencil and tape is needed for the pendulum. (a) True (b) False
31. 31.🕰️ Which old clock uses a pendulum to keep time? (a) a grandfather clock (b) a sundial (c) a phone (d) a digital watch
32. 32.True or false: a magnet is needed for the pendulum. (a) True (b) False
33. 33.True or false: a balloon is not needed for the pendulum. (a) False (b) True
34. 34.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: the string length is what we measure. (a) False (b) True
35. 35.🧺 Which of these is not needed for the pendulum? (a) a mirror (b) a stopwatch (c) a string (d) a heavy nut or washer
36. 36.🧺 Do we need a ruler for the pendulum? (a) not needed (b) needed
37. 37.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is kept the same? (a) time for 10 swings (b) the string length (c) how far we pull it back
38. 38.🕰️ A pendulum takes 3 seconds for one swing. How many swings does it make in 30 seconds?
39. 39.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: the same hook is the one thing we change. (a) True (b) False
40. 40.🕰️ A pendulum makes 15 swings in 30 seconds. How many seconds does one swing take?

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