Newton's first law - inertia
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Newton's First Law states that 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. (Physics Classroom) Newton's First Law can be seen during a rugby hit. On average, every rugby player will have at least 16 hits per game. A rugby hit occurs between a defender and an attacker holding the ball. When the ball handler is running with the ball, his body as well as the ball are in motion. When the ball runner is hit by the defender, his motion will come to end due to the unbalanced force acting upon him. If the defender releases the ball upon being hit, his motion will come to an end, but the motion of the ball will not because there is no other force acting upon it. The ball will remain in motion and the player will come to a halt by the defender.
Newton's second law - f = m * a
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Newton's Second Law states that the acceleration of an object as produced by a NET force is directly proportional to the magnitude of the NET force, in the same direction as the NET force, and inversely proportional to the mass of the object. (Physics Classroom) In ruby, Newton's Second Law can be seen during a scrum. A scrum involves two groups of eight players, most likely the larger forwards of each team, binding together and attempting to move the other teams pack back so that their hookers can hook the ball to the scrum half and gain possession. By using the formula F = M * A, we can see that the tea, who's scrum has a larger mass in their pack will be able to create a greater force, therefore allowing them to apply more force onto the oppositions pack to gain possessions of the ball and be able to score.
Newton's third law - opposite reaction
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Newton's Third Law states that for every action, there is a reaction of equal magnitude and opposite reaction. (Physics Classroom) The reaction law can be seen from the very start of the game, to the point after a try is scored. Newton's Third Law can be seen during a drop kick or a placed kick to gain two extra points for your team. When a player kicks the ball, the force of the foot onto the ball will cause that part of the ball to become indented and create a pocket of air. This pocket will then have a reaction that will pop the pocket back out and cause the ball to move.