InterActions in Physical Science

Two students, Carlos and Chantel, wanted to measure how long it took for a pendulum to swing back and forth. They used a washer tied to a string as a pendulum. They disagreed on whether they could obtain the “true” (exact) value for their measurement.

pencil

Do you agree with Carlos, with Chantel, or with neither?

Without talking to your group members, record your own answer and your own reason on your record sheet.

discussion baloon

Participate in a class discussion.

Have your teacher check your plan for safety

You and
your partner
will need:
• clock with a second hand
• pendulum (washer attached to a string)
• metric ruler

Explore Your Ideas

To find out whether Carlos or Chantel makes more sense, you and your partner will perform an experiment involving a pendulum.

Experiment 1: How long does it take for a pendulum to make 10 back and forth swings?

In performing this experiment, you will gather evidence that will help you answer the key question for this activity.

STEP 1 With your partner, decide how to perform the experiment.
Be prepared to describe your method if asked.

pencil

Record how long it takes for your pendulum to make 10 complete
back and forth swings.

STEP 2 Post your measurement in a class data table.