Newton's First Law: The first law of Newton is that all objects will remain at rest or continue to travel at constant velocity until an external force is applied to it. This is also referred to as "inertia". An example of this law would be a "snap" in football which occurs when the player holding the ball against the ground launches the football to the quarterback. Before this ball is snapped it is in a state of rest so there are no forces acting upon it except the force or gravity and the force of normal which balance each other out. This means that the ball is not in motion. As soon as the Center position applies an external force to the ball that is greater the static friction acting upon the ball, it will begin to travel towards the direction of the applied force. The ball will continue to accelerate and travel and a high velocity until it reaches the targeted player where the motion of the ball is stopped. When this ball hits the intended player's hands all the forces that hits the hand is bounced back at the ball. This is newton's first law in American Football.
Newton's Second Law: Newton's Second law states that the relationship of an object's mass (m), its acceleration (a), and the applied force (F) is displayed through the equation of F=ma. This formula allows up to compare the difference forces applied when given different masses of objects. This law also tells us that if net external force is not zero, the object will accelerate in the direction of the net force. We can compare the acceleration of two footballs with different masses. Take the CFL football for an example which is 430g that is 30 grams heavier than the 400g NFL football. If the same force is applied to them the heavier ball will have a lower velocity as well as acceleration. That means if we want the balls going at the same speed more force has to be applied to the heavier ball.
For an example a CFL and NFL football are both punted with a force of 100N [Forward] (Assume no friction)
Newton's Second Law: Newton's Second law states that the relationship of an object's mass (m), its acceleration (a), and the applied force (F) is displayed through the equation of F=ma. This formula allows up to compare the difference forces applied when given different masses of objects. This law also tells us that if net external force is not zero, the object will accelerate in the direction of the net force. We can compare the acceleration of two footballs with different masses. Take the CFL football for an example which is 430g that is 30 grams heavier than the 400g NFL football. If the same force is applied to them the heavier ball will have a lower velocity as well as acceleration. That means if we want the balls going at the same speed more force has to be applied to the heavier ball.
For an example a CFL and NFL football are both punted with a force of 100N [Forward] (Assume no friction)
Nfl football
![Picture](/uploads/1/5/1/5/15153444/1353701756.jpg)
Given: m = 0.400kg, Fnet = 250N
Required: acceleration
Analysis: F = ma
Substitute: 250N = (0.400kg) (a)
Solution: a = 625m/s^2
Therefore the acceleration of the NFL football is 625m/s^2
Required: acceleration
Analysis: F = ma
Substitute: 250N = (0.400kg) (a)
Solution: a = 625m/s^2
Therefore the acceleration of the NFL football is 625m/s^2
Cfl Football
![Picture](/uploads/1/5/1/5/15153444/6517090.jpg?247)
CFL Ball:
Given: m = 0.430kg, F = 100N
Required: acceleration
Analysis: F = ma
Substitute: 100N = (0.430kg) (a)
Solution: a = 232m/s^2
Therefore the acceleration of the CFL Football is 232m/s^2
Given: m = 0.430kg, F = 100N
Required: acceleration
Analysis: F = ma
Substitute: 100N = (0.430kg) (a)
Solution: a = 232m/s^2
Therefore the acceleration of the CFL Football is 232m/s^2
![Picture](/uploads/1/5/1/5/15153444/2013562.jpg?1)
Newton's Third Law: Newton's third and final law is that for every action force there is a simultaneous reaction force that is equal in the same magnitude but opposite in direction. Some implications of this law is that the action and reaction are instantaneous as soon as you kick the ball the same force is applied back to you in an instant. For an example in football when the kicker strikes the ball with his foot the reaction force is applied right back to him. If you find the amount of force that the kicker applied to the ball the exact same force is applied right back to your foot.
Calculations for forces acting on the football:
Force of Gravity:
Fg = m(Mass)g(Acceleration due to Gravity)
= (0.400kg)(9.8m/s^2) (down)
= 3.92N (Down)
Force of the normal is also 3.2N but in a upwards direction
Acceleration of Kicker`s Foot: (Assume no friction)
Given: F net = 300N Mass of kickers foot = 15kg
Required: Acceleration
Analysis: Fnet = ma
Substitute: 500N = (10kg)(a)
Solution a = 500N/10kg
= 50 m/s^2
Therefore the acceleration of the kickers foot is 50m/s^2.
Calculations for forces acting on the football:
Force of Gravity:
Fg = m(Mass)g(Acceleration due to Gravity)
= (0.400kg)(9.8m/s^2) (down)
= 3.92N (Down)
Force of the normal is also 3.2N but in a upwards direction
Acceleration of Kicker`s Foot: (Assume no friction)
Given: F net = 300N Mass of kickers foot = 15kg
Required: Acceleration
Analysis: Fnet = ma
Substitute: 500N = (10kg)(a)
Solution a = 500N/10kg
= 50 m/s^2
Therefore the acceleration of the kickers foot is 50m/s^2.
Free body diagram
![Picture](/uploads/1/5/1/5/15153444/9795869.jpg?341)
The free body diagram to the right displays the forces acting upon one player to the other as a tackle is completed. Player one who is 98kg applies a force of 800N forward while tackling player two. As player one comes into contact with player two the force that is applied onto player two also comes back at player one. This is cause by newtons 3rd law which is any force applied to an object the same force will be applied back onto you right away. This explains the fact that when you run into someone you may feel pain yourself because the same force just came back at you! These two players are affected by the force of gravity as well as the force of normal since that are both touching the ground. Since the mass of player one is greater than player two's, player two will have a displacement because the force of player one will send player two moving forward.