Institute of ImaginationRobot LabRobot Lab

Step 5 of 7

Add some weight

Open an end flap, press the Blu Tack or plasticine inside right over the back axle, and close the flap.

Cut-away side view of the box with its end flap open and a lump of Blu Tack inside, right over the back axle. One arrow presses the lump down, and a second arrow shows the back wheel pressed onto the floor; the front wheel has no weight over it.