Special weights to place in cars/bikes/vehicles with little inertial mass, but heavy gravitational mass would improve traction but not affect acceleration (on a flat plane).
If you took the opposite to extremes, high inertial mass with low gravitational mass...remember the whole planet is moving quite quickly! The reason it sticks together is everything is moving relative to everything else. So, such a material would likely not be able to exist free-standing on the planets surface, it'd be ripped away by inertia. It'd make an interesting fuel for lift off if it could be harnessed.
If you took the opposite to extremes, high inertial mass with low gravitational mass...remember the whole planet is moving quite quickly! The reason it sticks together is everything is moving relative to everything else. So, such a material would likely not be able to exist free-standing on the planets surface, it'd be ripped away by inertia. It'd make an interesting fuel for lift off if it could be harnessed.