Pendulum Timer
Class 7 Science: time and motion (simple pendulum)
Change the string length, the bob and the swing size, then time 10 swings. Find out what really changes the time period.
Words to know
- Pendulum
- A weight (bob) hanging from a string that swings to and fro.
- Oscillation
- One complete swing: from one side to the other and back.
- Time period
- The time taken for one oscillation.
- Bob
- The small heavy ball at the end of a pendulum.
- Periodic motion
- Motion that repeats itself after equal intervals of time.
Quick check
Answer 3 questions to check what you learned.
Try at home
Tie a key to a thread. Count how many swings it makes in 30 seconds with a long thread, then with a short one.