I have a device 4cm X 5cm X 15cm that stands on asphalt/concrete/road. So, the device is taller than its base which makes contact with the asphalt.
I want to maximize the friction so that the device stands as well as possible without any attachment.
I'm considering a thin rubber add-on attached at the bottom of the device and I'm wondering what is the best design for such rubber to maximize the friction with asphalt.
I selected rubber because it has the highest friction coefficient with asphalt - there is a reason why tires are made of rubber...
But how should I design the bottom side of this rubber part that will be in contact with the asphalt? Here is an idea which I got inspiration from a bathtub mat. What is the best pattern possible? And what should be the pattern size (small or big relative to the 5cm X 4cm area)?