The Pullback Car

You will need:

  • An empty soap dish
  • Two long needles
  • Four round plastic buttons
  • A broomstick bristle (about 20cm long)
  • Thread

1. Make holes in the soap dish: one each on both ends of the long sides, as in the pic.

2. Heat the tip of a needle and poke it into the centre of a button. Repeat the process with the other needle and another button.

3. Fix both the button-needle contraptions into the holes of the soap dish. Now heat the eyes of the needles and fix a button on each.

4. Tie thread on one end of the broomstick bristle. Fix the other end of the bristle to the back of the soap dish.

5. Tie the other end of the thread to the needle of the front wheels.

6. Put the car on the ground and pull it back. The thread winds around the needle and the broomstick bristle bends.

7. Release the car. The potential energy stored in the bristle gets converted to kinetic energy and the car moves forward.


by Arvind Gupta (

artwork by Somesh Kumar


  • Abhishek June 1, 2012

    This is a interesting thing but not so easy. Cooooool……………………

  • Tamiey July 31, 2012

    Thankyou so much…….Your website really helped me with my science project.

  • Krishna September 13, 2012

    Oh I have fond memories of that noise when my Dad would oil tighns. Your t.v easel is brillant! I have not seen that idea anywhere..are you the first to think of it? We are keeping ours tucked in a t.v cabinet for when grandbabies come along. I don’t want to worry about a toddler pulling it down like my own son did when he was a toddler. And that was the old bulky t.v’s luckily he was not hurt, only the t.v broke! Thank you for your input today. I think I may be a bit burned out on blogging all the changes blogger keeps making are tiresome.

  • Riya September 13, 2012

    Hi, I randomly found your blog while lokiong for stamp carving instructions. I absolutely adore your style, it’s so bright and fun, and your stamps have made me break out the carving set that’s been in its packaging for 3 years. It’s been a joy to read back through all your beautiful work! Have added this blog to my Livejournal feeds so I can keep being inspired :D Thank you for sharing.

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