Smartivity Super Duper Propulsion Car  (Multicolor)

Super Duper Propulsion car now comes with extendible tracks and additional learnings about friction and gradients. Once assembled, children can lay out the tracks they have build and change the length of the track as they please. The tracks have a flat element and an adjustable gradient/slope element. Using the breakers on the flat tracks, children learn the concept of friction and braking. While by changing the notches of the adjustable gradient children understand the variation in power required to climb an incline.