1. An Amazing Invention  Pendulum Clocks  First made in 1656  First accurate clocks  They are very much the same today QuizMore Info

2. Parts of a Pendulum Clock QuizWeightsPendulumFaceMore Info

3. How The Weight Works  Weight provides clock with potential energy  Weight is attached to a drum (green part of the picture)  Friction is used to slow the weight down QuizWeightsPendulumMore Info

4. What Does the Pendulum Do? The pendulum regulates the weight’s movement. Without the pendulum, the weather can affect the weight’s movement. The swing of the pendulum is only affected by gravity and its length. Thus, the swing of the pendulum is constant, and the weight’s movement is constant. QuizWeightsFaceMore info

5. How the Pendulum Works The picture to the left is the escarpment. It is made up of a gear and an anchor attached to the pendulum. The gear moves when the pendulum moves. The anchor allows one tooth of the gear to escape at a time. The anchor provides energy for the pendulum to work. QuizWeightsFacePendulumMore Info

6. How Do the Hands Move The weight in the clock is attached to gears. In a clock the gears are behind the drum. The gears are attached to and move with the escarpment. The hands of the clock are attached to different gears with shafts. Each gear moves at a different rate so that the hour, minute and second hands move at the right speed. QuizWeightsPendulumMore Info

7. Test Your Memory 1.Pendulum clocks were first made in 1656 1704 1639 1760 2. The weight provides the clock with decoration potential energy mass 3. The escarpment is made up of teeth and shapes rope and weight gear and anchor pendulum 4. One major part of the pendulum clock is the second hand case weight chime abcd b c c ac a d b ba More Info

8. To Learn More Websites: “How Pendulum Clocks Work.” http://www.howstuffworks.com/clock.htm. http://www.howstuffworks.com/clock.htm. “Clocks...Teaching Time.” http://www.fi.edu/qa00/attic3/index.html http://www.fi.edu/qa00/attic3/index.html “A Revolution in Timekeeping.” http://physics.nist.gov/GenInt/Time/revol.html. Books: This Book Is About Time. By Marilyn Burns Inside a Clock. Clair Seymore

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