In a basic model of friction, the magnitude of this force depends on two things: the types of materials interacting and the force with which they're pushed together.

The filmmakers of “Documenting Police Use of Force” spoke about how they created a visual narrative that traces why and how people die in the wake of police’s use of “less-lethal force.” ...

“The video is disturbing and a clear example of excessive force by police,” Casey said. “We have seen these instances of abuse too often.