Found the following statement on the web: You can't hit a feather in midair with a force of 200 N because the feather is not capable of exerting a 200 N force on you. The forces "you hit feather" and "feather hits you" are a Newton's Third Law action/reaction force pair, so they must always be exactly equal in size. If an object isn't strong enough to exert a certain amount of force on you, then you can't exert that amount of force on it. My daughter had a slightly different version of this question in her eighth grade physics class: Can you hit a feather in a frictionless environment with a 200N force? The teacher explained that "A feather could not move that fast." I don't quite get these explanations. How would one go about calculating or determining the ability of an object to exert a particular amount of reactive force? Why can't a feather move and any speed in a "frictionless environment?" Thanks for any help or explanation you can provide!