By Thomas C. Hsu
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The reset (O) button does two things. If you press reset once, the display freezes, allowing you to write down a number before it changes. Pressing reset a second time starts another measurement. 42 Investigation 9A E a. The Motion of a Pendulum Thinking about what you observed Write down the time measurement you get from the Timer. b. Is the time you get from the Timer the period of the pendulum? Explain why the time is or is not the period of the pendulum (hint: compare to your results from part 2).
Explain why the time is or is not the period of the pendulum (hint: compare to your results from part 2). c. F Explain how the time measured by the Timer is related to the period of the pendulum. What variables affect the period of a pendulum? You can change several things about the pendulum. • The amplitude (angle) • The mass (add or subtract washers) • The length of the string (measure as shown) a. Think of three experiments you can do to see what variables affect the period of the pendulum. Write down one sentence describing each experiment.
D. Why does the bulb go out when you open the switch? 35 C Conductors and insulators Materials in which electric current flows easily are called conductors. Materials through which current does not flow through easily are called insulators. 1. Break one connection in your one-bulb circuit. 2. Complete the circuit by touching different materials between the wire and the post. 3. Which materials allow the bulb to light and which do not? D Thinking about what you observed a. Make a table listing the materials as either conductors or insulators.