toy treasures - arvind gupta (60 kb doc)

PULLBACK CARMr. K.V.S. Kartha - an activemember of the Kerala Sastra SahityaParishad (KSSP), devised this verydelightful car.On being pulled back this car storesenergy.On leaving it - this energy is releasedand the car dashes forwards.Take a small plastic soap case andmake four holes in it with a dividerpoint as shown in Fig (1).Heat the tip of a long needle Fig (2)and poke it in the center of a cheapquality plastic button Fig (3).Put two such button and needleassemblies in the holes of the soapcase.Heat the eye end of the needles andaffix one button each Fig (4).The buttons become the wheels andthe needles become axles.Now tie some sewing thread on thethin end of a 20-cm long broomstickFig (5).Tape or tie the broomstick well to theside of the soap case.Tie the other end of the thread to theneedle of the front wheels Fig (6).Now keep the car on the ground andpull it back.You can see the thread rolling up onthe needle axle.This results in the broomstick bowingdown and storing energy Fig (7).On releasing the car the storedenergy in the broomstick propels thecar forwards Fig (8).