sentences: rubbing different materials can cause electrical charge of the materials to be unbalanced
docs: rubbing is friction. electrical_charge is non_aspectual_quantity. electrical_charges is additive. electrical_conductance is non_aspectual_quantity. matter has no_electrical_charge electrical_charge is electrical_quantity. tight_supplies_of_cheese has caused_prices_to_go_up scrubbing is rubbing. not_all_matter has electrical_charge wiping is rubbing.