Newtons 1st Law: An object in motion will stay in motion unless opposed by an outside force,like football players about to collide.
Newtons 2nd Law:States that the acceleration of an object dependent on the NetForce on a object. Like if you push a bulldozer and a car the car will be easier to move because it has more mass
Newtons 3rd Law: For every reaction there was a equal and opposite reaction. If these teenagers were about about to bump into each other and hit the floor, then the opposite reaction would be each other and the equal reaction would be the floor.