Gizmos Name Orvin August Date: 02/ 01 / 23 Student Exploration: Pendulum Clock Vocabulary: bob, calibrate, controlled experiment, gravity, mass, pendulum, period, variable Prior Knowledge Questions (Do there 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.) clocks swing sets 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? Gizmo Warm-up: Tick, Tock, Click 1. On the Pendulum Clock Glamo, a pendulum swings back and forth. The second hand of the clock moves forward one tick every time the pendulum swings across. Open the Tools palette. Drag an arrow next to the pendulum bob as shown in the image at right. Click Play ( *) and watch as the bob swings away from the arrow then back to it. 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. Evimate the period of this pendulum. 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