You have to apply a force to counter the force of friction. In order to move fast the friction has to be reduced. So we have the invention of wheels. Rolling friction is much less than sliding friction. Experience shows that much less force is required to roll an object than to slide or drag it. But wheels are not used in boats. why? The friction on water is much less than that between solid surfaces. So because the friction is less the wheels cant be used. So does that imply wheels are used when in contact with a surface where friction is more?.