JUST A SPRING AND A STRING: Zoom over 15 meters-that?s 50 feet- with the simple mechanics of a spring and string! No need to worry about batteries.
HOW DOES IT WORK?: The young engineer and scientist will soon discover how powerful a coiled spring can be in providing simple elastic, or stored energy.
THEN WHAT?: Replace the four wheels with old CD?s to see if you can go further or faster.
LEARN FUN FACTS: What happens if the spring is twisted? How does a spring store energy? What do a mousetrap, clothes pin, and watch all have in common?
JUST A SPRING AND A STRING: Zoom over 15 meters-that?s 50 feet- with the simple mechanics of a spring and string! No need to worry about batteries.
INCLUDED IN KIT: Front baseplate (narrow) with spring and wire frame installed, rear baseplate (wide) with axle and winding drum installed, adhesive foam, screws (12), set arm cap case (base and cover), set arm holder case (base and cover, short axle, string, small wheels (4), connecting rods, (2), winding arm, large wheels (4), sticker sheet. ADDITIONAL ITEMS NEEDED: Small Phillips head screwdriver and additional ?wheels? if desired.