One of the football players is heaver than the other. The heavier football players is the unbalanced force against the lighter football players.
Newton's First Law of Motion: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
Newtons Third Law of Motion: For every action there is an equal and opposite re-action. The force from the engine pushes against the gravity in space.
Newtons Second Law: Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). The goalie will stop the acceleration of the ball.
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