The pendulum clock was invented in the 16th century and improved over time. It uses a swinging pendulum to keep accurate time and allow people to keep schedules and promises. The pendulum clock works through a system of gears controlled by the swinging pendulum to move the hands on the clock face. While it allows for organization, the pendulum clock requires resources to function and can lose time if not properly set.

1. Pendulum Clock By: Junho, Dh

3. Pendulum

5. Purpose Save time Keep promise/meeting Accurate time

6. How it works? Swing back and forth Time base – gears Small gear rotate Each gear, face of the clock

7. How simple machine… Controlled force Self working

8. One World Sociable Keep Meetings and promises Friend ship

9. Advantages Sociable Keep time well Accurate time

10. Disadvantage Need battery/ resource When time is not set

12. Huygen’s principle. Cambridge Physics Huygen’s principle. http://www-outreach.phy.cam.ac.uk/camphy/xraydiffraction/xraydiffraction4_1.htm. April 19th.