With this experiment, also involving a force, (ie a car dragging a pen across paper), I wanted to see what the end result would be using a remote control car that not only went backwards and forwards but flipped upside down too. The rules I set were only allowing marks to be made using an electric miniature car to do so, ie. not physically drawing it by hand.
Method (starting point): Attaching Sharpie pens to either side of the car and placing it in a confined space – a trailer with high sides – on top of a piece of paper that was held in place by masking tape. Using the remote control then allowing the car to move at speed across the paper.