# Try This TOPS IDEA!

## Article excerpt

[ILLUSTRATION OMITTED]

paper clip pendulums ... adapted from PENDELUMS #34 by TOPS Learning Systems

1. Make a chain of paper clips to swing like a pendulum. This scientist is finding the frequency of a 5-clip chain.

2. List your data in a table.

```ANSWERS                 9/69

2. Length/Frequency:   12/60
1/208    5/92       16/52
2/146    6/84       20/46
3/120    7/78       24/42
4/104    8/73       28/39
```

OBJECTIVE

To graph how the frequency of a paper-clip-pendulum changes with length.

LAB NOTES

Photocopy the lab for each student or lab team.

Step 1. Students can pull a "handle" clip open into a hook as a reminder not to count its length.

Step 2. It helps to start with a slower, easier-to-count 16-link chain and work up towards shorter, faster chains. High frequency pendulums can be estimated by counting cycles for 10 seconds and multiplying by 6. The frequency of a single clip chain is given as 208 c/m. …

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