Why does this work?
This experiment takes advantage of having an uneven weight spinning on a motor that is not in the center of the robot's balance. Spinning the uneven weight causes the motor to vibrate rapidly and this force is transferred to the body of the Scribblebot. As you also put the motor away from the center of the robot's balance the robot can move.
Try placing the motor in different positions on the scribblebot (eg. facing upwards). you could also decorate the scribblebot in other ways... check out these scribble bots made by students recently for a science fair at the Peninsular Community of Schools in Sydney.
Scribblebots at the Peninsular Community of Schools in Sydney science fair
Spinning objects that are unbalanced cause a lot of vibration. When you get your car's wheels balanced at the mechanic small weights are added to the rim of the tyre so that the weight is evenly distributed. This prevents unnecessary wear on the shock absorbers, struts and steering assembly of the car caused by the vibrations of unbalanced wheels (plus reduces tyre wear too!). Balancing your car's tyres makes your car safer to drive.
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