4. Notepad

5. Books

6. Bottle with eraser attached

7. Cotton Twine & Thread

8. Bottle with Cotton Twine

9. Bottles filled with water

10. Ball with thread

11. Marker, Tape, Scissors

12. Card Boxes

13. Toy Car

14. Toothpaste

15. Toothbrush

16. Line Tracking Robot

17. Track (for robot)

18. Keyboard

19. Chairs

20. Ramp

21. Spray Can

22. Soccer Ball

23. ‘Hamburger’

25.  GPE of the hamburger is converted into KE as it travels down the ramp  When the hamburger hits the ramp, the KE is transferred to the soccer ball, giving it KE

26.  Having KE, the soccer ball drops off the table and continue moving, hitting the book  KE is transferred from the soccer ball to the book, causing the book to topple

27.  As the 1 st book topples, it creates a domino effect and it continues throughout

28.  As the KE is being transferred to the small blue book, it topples and lands onto a string (attached to the bottle and the end of the chair).

29.  As there is tension in the string, the bottle topples over, releasing the string attached to the ball which it is sitting on

30.  The ball is released after the bottle toppled and it hits the ‘play’ button on the keyboard, starting the song ‘London Bridge’

31.  As the ball still has KE, it travels down the keys and hit the book, once again the domino effect is triggered

32.  When the blue book topples, the KE is being transferred to the green toy car, causing it to move down the ramp

33.  As there is tension in the string, the eraser is being pulled away from the wheel when the car hits the string, freeing the robot There’s a string attached from the bottle to an eraser which is in front of the robot’s wheel

34.  The robot travels on the track and finally hits the book, which topples onto the bottle, releasing the cotton twine, which is attached to another bottle[not shown]

35.  When the cotton twine is released, the bottle drops onto the toothpaste, thus squeezing it

37.  The soccer ball went out of track and failed to start the domino effect  The gaps between the books were too far and some failed to continue the domino effect

38.  The tension in the string tied to the water bottle was too small, allowing the book to land onto the string without triggering any other movements  The ball was not directly above the ‘play’ button of the keyboard and no music was played even after the ball was released

39.  External forces like wind exerted a force on part of the domino chain and messed up our Rube Goldberg machine  Carelessness in our movements caused mess-ups in our preparations

40.  We did not manage to build our machine according to our original design due to miscalculations and misjudgments  We had to make use of common household objects to substitute those that we lacked