Hello, Few questions about these things.This is not homework!! 1. Is Newton's 3rd law caused by conservation of momentum? 2. If I drop a stone into a pond. The stone would exert a force on the water and the water would exert a force on the stone. So why doesn't the stone move up!! 3. Is air resistance caused by collisions with air particles. How come it takes time neutralize the force. I mean if I hit a air molecule with 10N force it would exert 10N back. So If I threw something at 10N why wouldn't it immediately stop after hitting an air molecule. I know these questions demonstrate a very poor understanding but please help me so I can improve!!Thank you!!