Simple:
* The two teams had opposing views on how to play the game.
* The opposing lawyer presented a strong argument.
More complex:
* Despite their opposing political ideologies, they found common ground on the issue of environmental protection.
* The research presented two opposing theories about the origins of the disease.
* The artist's work explores the tension between opposing forces of light and darkness.
Figurative:
* Her words were like opposing forces, pulling him in two different directions.
* The two characters in the novel are opposing forces, their personalities clashing dramatically.
Remember that "opposing" can be an adjective, meaning "in conflict" or "contrasting," or a verb, meaning "to go against" or "to resist." The context will determine the best usage.