We hope that these programs will have a positive 'impact on' the community. [=will help the community]
The stress of her job is having a negative 'impact on' her health. [=is harming her health]
We need to be concerned about the environmental 'impacts' of all this construction.
(..) the fall is? No. It's fascinating what happens to bodies when they hit the rocks from such a height. The impact breaks them right apart. Like eggs dropped on the floor. Sometimes pieces remain intact. (..)2014 TvShow: Game of Thrones Title: Mockingbird Season: 4 Episode 7