Gizmos Pendulum Clock

Pendulum Clock Answer Key
Vocabulary: bob, calibrate, controlled experiment, gravity, mass, pendulum, period, variable
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. A pendulum is a bob, or weight, hung from a fixed point so that it can swing back and forth.
What are some objects that swing like a pendulum? (List as many as you can.)
Answers will vary. [Students might think of playground swings, pendulums in grandfather
clocks, wrecking balls, a hypnotist’s watch, the large Foucault pendulum in a museum, or
any number of other swinging items.]
2. The period of a pendulum is the amount of time that it takes a pendulum to complete one
full back-and-forth swing. How do you think you could make the period longer or shorter?
Answers will vary.
Gizmo Warm-up: Tick, Tock, Click
1. On the Pendulum Clock Gizmo, a pendulum swings back
and forth. The second hand of the clock moves forward
one tick every time the pendulum swings across.
ï‚· Open the Tools palette. Drag an arrow next to the
pendulum bob as shown in the image at right.
ï‚· Click Play ( ) and watch as the bob swings away
from the arrow then back to it.
ï‚· Click Mark time every time the bob touches the
arrow. The numbers tell you how many seconds are
between each click, the period of the pendulum.
2. Estimate the period of this pendulum. About 2.8 or 2.9 s.
[Assumes a length of 200 cm, which is the default.]
3. Something is wrong with this clock! To keep the proper time, the pendulum period should be
exactly 2 seconds. Will this clock run too fast or too slow?
The clock will run too slow because its period is greater than 2 seconds.

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