Newton’s first law of motion says that the motion of an object does not change as long as the net force acting on the object is zero. It also says that an object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force.
The football would stay in rest until the kicker kicks the ball.
The bigger the football player the more force is needed to move him.
Newton's second law states that heavier objects and objects that have more mass require more force to accelerate and move the same distance as lighter objects.
When one football player hits another football player, they both feel the impact.
When an object exerts a force on a second object the second object exerts an equal and opposite force on the first object.