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### Law of interaction

• 1. The Law of InteractionThe Law of Interaction Newton’s Third Law of MotionNewton’s Third Law of Motion
• 2. 33rdrd LawLaw  For every action force, there isFor every action force, there is an equal and opposite reactionan equal and opposite reaction force.force.  In equation: FIn equation: FAonBAonB = -F= -FBonABonA
• 3.  Forces occur in pairs.Forces occur in pairs.  Example: for object A and B:Example: for object A and B: Action force: “A pushes B”Action force: “A pushes B” Reaction force: “B pushes A”Reaction force: “B pushes A”  The action and reaction forces occur atThe action and reaction forces occur at exactly the same time!exactly the same time!  If A pushes B, then B at the same timeIf A pushes B, then B at the same time pushes Apushes A EVEN IF B HAS NO LIFE!EVEN IF B HAS NO LIFE!
• 4.  ““Equal”Equal” In Newton’s Third Law, “equal” means:In Newton’s Third Law, “equal” means: Equal in magnitude (strength)Equal in magnitude (strength)  The action and reaction forces haveThe action and reaction forces have exactly the same MAGNITUDE.exactly the same MAGNITUDE. Example: If Bob pushes the wall with 400Example: If Bob pushes the wall with 400 N of force, then the wall pushes back BobN of force, then the wall pushes back Bob with 400 N of force too.with 400 N of force too.
• 5.  ““Opposite”Opposite” In Newton’s Third Law, “opposite” means:In Newton’s Third Law, “opposite” means: Opposite in direction.Opposite in direction.  Example:Example: If Bob’s foot kicks the soccer ball forward,If Bob’s foot kicks the soccer ball forward, then the soccer ball kicks Bob’s footthen the soccer ball kicks Bob’s foot backwards.backwards.
• 6. 33rdrd LawLaw According to Newton,According to Newton, whenever objects A andwhenever objects A and B interact with eachB interact with each other, they exert forcesother, they exert forces upon each other. Whenupon each other. When you sit in your chair,you sit in your chair, your body exerts ayour body exerts a downward force on thedownward force on the chair and the chairchair and the chair exerts an upward forceexerts an upward force on your body.on your body.
• 7. 33rdrd LawLaw There are two forcesThere are two forces resulting from thisresulting from this interaction - a forceinteraction - a force on the chair and aon the chair and a force on your body.force on your body. These two forces areThese two forces are calledcalled actionaction andand reactionreaction forces.forces.
• 8. Action: earth pulls on you Reaction: you pull on earth Action and Reaction on Different Masses Consider you and the earth
• 9. Newton’s 3rd Law in NatureNewton’s 3rd Law in Nature  Consider the propulsion of aConsider the propulsion of a fish through the water. Afish through the water. A fish uses its fins to pushfish uses its fins to push water backwards. In turn,water backwards. In turn, the waterthe water reactsreacts by pushingby pushing the fish forwards, propellingthe fish forwards, propelling the fish through the water.the fish through the water.  The size of the force on theThe size of the force on the water equals the size of thewater equals the size of the force on the fish; theforce on the fish; the direction of the force on thedirection of the force on the water (backwards) iswater (backwards) is opposite the direction of theopposite the direction of the force on the fish (forwards).force on the fish (forwards).
• 10. 33rdrd LawLaw Flying gracefullyFlying gracefully through the air, birdsthrough the air, birds depend on Newton’sdepend on Newton’s third law of motion. Asthird law of motion. As the birds push down onthe birds push down on the air with their wings,the air with their wings, the air pushes theirthe air pushes their wings up and giveswings up and gives them lift.them lift.
• 11.  Consider the flying motion of birds. A bird flies byConsider the flying motion of birds. A bird flies by use of its wings. The wings of a bird push airuse of its wings. The wings of a bird push air downwards. In turn, the air reacts by pushing the birddownwards. In turn, the air reacts by pushing the bird upwards.upwards.  The size of the force on the air equals the size of theThe size of the force on the air equals the size of the force on the bird; the direction of the force on the airforce on the bird; the direction of the force on the air (downwards) is opposite the direction of the force on(downwards) is opposite the direction of the force on the bird (upwards).the bird (upwards).  Action-reaction force pairs make it possible for birdsAction-reaction force pairs make it possible for birds to fly.to fly.
• 12.
• 13. Other examples of Newton’sOther examples of Newton’s Third LawThird Law  The baseball forcesThe baseball forces the bat to the left (anthe bat to the left (an action); the bataction); the bat forces the ball to theforces the ball to the right (the reaction).right (the reaction).
• 14. 33rdrd LawLaw  Consider the motion ofConsider the motion of a car on the way toa car on the way to school. A car isschool. A car is equipped with wheelsequipped with wheels which spin backwards.which spin backwards. As the wheels spinAs the wheels spin backwards, they grip thebackwards, they grip the road and push the roadroad and push the road backwards.backwards.
• 15. Action: tire pushes on road Reaction: road pushes on tire
• 16. 33rdrd LawLaw The reaction of a rocket isThe reaction of a rocket is an application of the thirdan application of the third law of motion. Variouslaw of motion. Various fuels are burned in thefuels are burned in the engine, producing hotengine, producing hot gases.gases. The hot gases push againstThe hot gases push against the inside tube of the rocketthe inside tube of the rocket and escape out the bottomand escape out the bottom of the tube. As the gasesof the tube. As the gases move downward, the rocketmove downward, the rocket moves in the oppositemoves in the opposite direction.direction.
• 17. Action: rocket pushes on gases Reaction: gases push on rocket
• 18. Newton’s 3Newton’s 3rdrd LawLaw  Suppose you are taking a space walkSuppose you are taking a space walk near the space shuttle, and yournear the space shuttle, and your safety line breaks. How would yousafety line breaks. How would you get back to the shuttle?get back to the shuttle?
• 19. Newton’s 3Newton’s 3rdrd LawLaw  The thing to do would be to take one of the tools fromThe thing to do would be to take one of the tools from your tool belt and throw it as hard as you can directlyyour tool belt and throw it as hard as you can directly away from the shuttle. Then, with the help ofaway from the shuttle. Then, with the help of Newton's second and third laws, you will accelerateNewton's second and third laws, you will accelerate back towards the shuttle. As you throw the tool, youback towards the shuttle. As you throw the tool, you push against it, causing it to accelerate. At the samepush against it, causing it to accelerate. At the same time, by Newton's third law, the tool is pushing backtime, by Newton's third law, the tool is pushing back against you in the opposite direction, which causesagainst you in the opposite direction, which causes you to accelerate back towards the shuttle, as desired.you to accelerate back towards the shuttle, as desired.
• 20. ReviewReview Newton’s First Law: Objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by an unbalanced force. Newton’s Second Law: Force equals mass times acceleration (F = ma). Newton’s Third Law: For every action there is an equal and opposite reaction.
• 21. 1st law: Homer is large and has much mass, therefore he has much inertia. Friction and gravity oppose his motion. 2nd law: Homer’s mass x 9.8 m/s/s equals his weight, which is a force. 3rd law: Homer pushes against the ground and it pushes back.
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