Rubber bands and springs store a lot of pottential energy. Here we’ll harness the potential energy in a rubber band to drive a mini road roller!.
I used to make these back in school.. we used to race them.. because of the low speed they had a lot more traction than other "toys" and hence could be raced uphill.. over all kinds of uneven surfaces.
Step 1: You Will Need:
1) Two bottle caps(plastic, metal or even crown caps can be used
2) One nail to make holes in the caps
3) One hammer to use with the nail
4) A rubber band
5) Two toothpics, or any other sticks of the same length
6) A wax candle
7) A piece of cardboard.. a little bigger than a visiting card
8) A pair of Scissors
Step 2: Make the Holes
and hammer it in.
After pulling it out, do the same to the other cap as well.
Now both caps will have holes in their centers.
Step 3: Add the Rubberband
break off the extra bit, and then place it with a rubber band as seen below
Step 5: Prepare the Candle Piece
clean the hole with the nail..
Step 6: Add the Candle to the Contraption
On the other end remove the wire and shove a toothpick through the rubberband to lock it in place..
Step 7: Check the Short Stick
don't do anything to the longer stick though!
Step 8: Final Touch
pull the two bottlecaps apart and put the cardboard roll between the two caps..
(the rubberband will be running through the roll)
ALL DONE! the next step shows you how to use it..