Simple Pendulum Experiment Worksheet

Science experiments lesson 23: Simple pendulum timing · Set 970 · 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.🔮 Predict: you make the string shorter. The swings get ___. (a) heavier (b) slower (c) stopped (d) quicker
2. 2.🛟 What is a safe bob for a home pendulum? (a) a small nut or washer (b) a sharp tool (c) a glass bottle (d) a heavy brick
3. 3.⚖️ 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 weight of the bob
4. 4.🕰️ Which old clock uses a pendulum to keep time? (a) a sundial (b) a digital watch (c) a phone (d) a grandfather clock
5. 5.🛟 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
6. 6.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is what we measure? (a) the same hook (b) how far we pull it back (c) the weight of the bob (d) time for 10 swings
7. 7.⚖️ 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 measure it (c) we change it
8. 8.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a stopwatch (b) turmeric powder (c) a string (d) a ruler
9. 9.🕰️ A pendulum takes 2 seconds for one swing. How many swings does it make in 28 seconds?
10. 10.⚖️ Fair test — does a longer string make the pendulum swing more slowly? Which of these is the one thing we change? (a) the string length (b) the same hook (c) time for 10 swings (d) the weight of the bob
11. 11.🧺 Which of these is needed for the pendulum? (a) a string (b) turmeric powder (c) a battery cell (d) yeast
12. 12.🕰️ A pendulum makes 5 swings in 5 seconds. How many seconds does one swing take?
13. 13.🕰️ A pendulum takes 3 seconds for one swing. How many swings does it make in 18 seconds?
14. 14.True or false: a string is not needed for the pendulum. (a) False (b) True
15. 15.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) a pencil and tape (b) a ruler (c) a string (d) a mirror
16. 16.🕰️ Why do we time 10 swings and divide, instead of timing just one? (a) one swing is too slow (b) it is more fun (c) 10 is a lucky number (d) it is more accurate
17. 17.🕰️ A pendulum makes 20 swings in 20 seconds. How many seconds does one swing take?
18. 18.🧺 Three of these are needed for the pendulum. Which one is NOT needed? (a) yeast (b) a heavy nut or washer (c) a stopwatch (d) a ruler
19. 19.True or false: yeast is not needed for the pendulum. (a) False (b) True
20. 20.🕰️ Does a heavier bob change the swing time? (a) no, hardly at all (b) yes, much faster (c) it stops swinging (d) yes, much slower
21. 21.True or false: a balloon is not needed for the pendulum. (a) True (b) False
22. 22.True or false: a pencil and tape is not needed for the pendulum. (a) False (b) True
23. 23.🧺 Do we need yeast for the pendulum? (a) needed (b) not needed
24. 24.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “time for 10 swings”? (a) we change it (b) we measure it (c) we keep it the same
25. 25.🕰️ A pendulum makes 5 swings in 10 seconds. How many seconds does one swing take?
26. 26.🧺 Do we need turmeric powder for the pendulum? (a) needed (b) not needed
27. 27.🧺 Which of these is not needed for the pendulum? (a) a ruler (b) a string (c) turmeric powder (d) a heavy nut or washer
28. 28.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: the string length is kept the same. (a) False (b) True
29. 29.🧺 Which of these is not needed for the pendulum? (a) yeast (b) a string (c) a ruler (d) a stopwatch
30. 30.🕰️ A pendulum takes 1 second for one swing. How many swings does it make in 20 seconds?
31. 31.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: time for 10 swings is the one thing we change. (a) True (b) False
32. 32.🧺 Which of these is needed for the pendulum? (a) a balloon (b) a pencil and tape (c) yeast (d) a mirror
33. 33.🧺 Which of these is not needed for the pendulum? (a) a ruler (b) a pencil and tape (c) a string (d) a magnet
34. 34.🕰️ A pendulum makes 5 swings in 15 seconds. How many seconds does one swing take?
35. 35.⚖️ Fair test — does a longer string make the pendulum swing more slowly? True or false: time for 10 swings is what we measure. (a) False (b) True
36. 36.🕰️ Which change makes a pendulum swing more slowly? (a) a heavier bob (b) a shorter string (c) a lighter bob (d) a longer string
37. 37.🔮 Predict: you make the string 4 times as long. How does the swing time change? (a) it stays the same (b) it becomes 4 times (c) it doubles (d) it halves
38. 38.True or false: yeast is needed for the pendulum. (a) True (b) False
39. 39.True or false: a ruler is not needed for the pendulum. (a) False (b) True
40. 40.🔮 A heavier child sits on the same park swing. What happens to the swing time? (a) about the same (b) it cannot swing (c) much faster (d) much slower

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