=Action and Reaction

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Newton's 3rd Law of motion

- It states that in every interaction there is a pair of forces acting on both the interacting objects. The force on the 1st object equals the force of the 2nd object but in opposite direction.
*Force ALWAYS come in PAIRS
Newton's 3rd Law of motion - It states that in every interaction there is a pair of forces acting on both the interacting objects. The force on the 1st object equals the force of the 2nd object but in opposite direction.


Situations of Action and Reaction


  • Boxing- A fighter who is about to punch another fighter and makes collision with that persons face.
  • Baseball- The pitcher throws the ball towards the batter during a baseball game. The bat makes contact with the ball and the ball goes over the fence. The baseball forces the bat to the left; the bat forces the ball to the right. Together, these two forces exerted upon two different objects form the action-reaction force pair.
  • Basketball player- when the basketball player goes down court and dribbles, the ball bounces off the court and back into the players hand.
  • A bird flies by use of its wings. The wings of the bird pushes the air down. Since forces result from mutual interactions, the air must also be pushing the bird upwards.


How does Newton's 3rd Law of motion be used in the real world...?


A variety of action-reaction force pairs are evident in nature. A fish swimming through the water. It's fins start to push water backwards to move the fish in a forward motion. But the push on the water will only accelerate the water.If the road exerts a forward frictional force on a car's tires, it pushes backward on the road. As wheels on your car spin, they grip the road and they push on the road backwards.As wheels on your car spin, they grip the road and they push on the road backwards.
"For every action, there is an equal and opposite reaction."DI143G3.jpg




Newton's 3rd Law of Motion Equations:
>F1 = -F2
>a=Fnet divided by m; A-accelerationF-forceM-mass


Resources:

  1. The Physics Classroom- "Newton's three laws of motion."
  2. The Physics Classroom- "Newton's 3rd Law of motion."
  3. PreventDisease.com-"Knockout: Humans Can Sure Take A Punch."