LAW OF INTERACTION.pptx third law of motion by Isaac Newton

Law of Interaction-third law of motion

1. REVIEW ____________is the change in speed and direction ACCELERATION

2. Vf FINAL VELOCITY

3. Vi INITIAL VELOCITY

4. t TIME

5. Law of interaction

6. Objectives 1. State Newton/s third law of motion. 2. Differentiate action force from reaction force. 3. Give example of situation related to the law of interaction

7. What happen when you put the object on the table? The object exerts force on the table and the subject exerts an upward force on the object.

8. What are the 2 forces that result from this interaction ? 1. From the table - the force exerted by the object on the table was ACTION FORCE. 2. Force on the object – the force exerted by the table on the object is the REACTION FORCE.

9. THIRD LAW OF MOTION – Law of interaction states when two object interacts that “Every action has an equal and opposite reaction”mean that there is a force on each object.

10. What is magnitude? Answer : The sum of all the forces that are acting on an object. What is the direction of the object ? Answer : The direction of force on the first object is opposite to the direction of force on the second one.

11. EXAMPLES: 1. While a frog is swimming, it pushes the water back, and the water pushes the body forward.

12. 2. The bird if flying upwards, the wings of the bird push the air downwards, the air pushes the bird upwards.

13. What happened when gun is fired? It exert the forward force on the bullet and the bullet exerts an equal and opposite reaction force on the gun that exists in recoil of the gun.

14. 4. If you are in a boat out of it onto the land What are the 2 forces involved? You pushing the boat behind and the boat pushing you forward, that’s why you see the boat go behind when you go forward.

15. A SAILOR JUMPS OUT OF A HUGE SHIP The sailor does apply a force on the ship and the ship also applies a force on the sailor.

16. CHALLENGE TO STUDENT Ask volunteers to demonstrate the Newton’s Third Law by making balloon rockets. Note : For every action, there is always an equal and opposite reaction. * The gas rushing out of the rocket or balloon is the action and the movement of the object in the opposite direction is the reaction.

17. ACTION-REACTION ACTIVITY Directions : Each group will be given a picture and will describe a particular situation. D raw arrows to show the magnitude and direction of action & reaction forces, then, provide an explanation on how these forces act on each other.

18. Example 1: :Throwing a rock into the water. Action : The rock hitting the water. R eaction : Causes an equal reaction with its splash

19. Example 2 : A person leaning on the wall Action : As you lean on the wall, the wall exerts a force R eaction : The body exerts effort on the wall.

20. HROUP 1 : A swimmer swimming

21. GROUP 2 : A PERSON SITTING ON A CHAIR

22. GROUP 3 : BOXING

23. GROUP 4 : Woman pushing a box

24. GROUP 5 : rocket

25. GROUP 6 : a man jumps from a boat

26. GROUP 7 : hammering a nail

27. Group 1 : A swimmer swimming forward Action : The swimmer pushes the water in the backward direction. Reaction : Water exerts a force on the swimmer

28. Group 2 : A person sitting on a chair Action : The weight of the man exerts a downward force on the chair. Reaction : The chair exerts an equal upward force on the man.

29. Group 3 : Boxing Action : Fist exerts force on jaw. Reaction : Jaw exerts force on fist.

30. Group 4 : Woman pushing a box Action : Woman push on block Reaction : Block push woman back.

31. Group 5 : Rocket Action : Rocket exerts a downward force on the exhaust gases Reaction : The gases exert an equal but opposite upward force on the rocket.

32. Group 6 : A man jumps from a boat Action : Man’s feet exert force on boat. Reaction : Boat exerts force on feet.

33. Group 7 : Hammering a Nail Action : Hammer pushing the nail Reaction : Nail pushing the hammer back

34. Newton’s Third Law states that for every action, there is always an equal and opposite reaction . IN MAPEH, action-reaction happen in a person swimming. The swimmer pushes against the water (action force), the water pushes back on the swimmer (reaction force) and pushes her backward For a tennis player swinging a racket and hitting a tennis ball, we know the racket exerts a force a force on the ball. The ball exerts a force on the racket.This force is equal in mag nitude and opposite in direction to the force the racket exerts on the ball.

35. A. Answer the following questions : Newton’s Third Law of Motion 1. Which of the following statements most correctly describes Newton’s third law of motion? a. When a force is applied to an object, the object exerts an equal-sized force in the opposite direction to the applied force. b. When a force is applied to an object, the object exerts an equal-sized force in the direction of the applied force. c. When a force is applied to an object, the object exerts a force in the opposite direction to the applied force that is proportional to the mass of the object that applies the force. d. When a force is applied to an object, the object exerts a force in the opposite direction to the applied force that is proportional to the mass of the object that the force is applied to.

36. 2. Two balls of equal mass collide head-on, as shown in the diagram. The balls move at speeds 𝑉 and 𝑣,respectively, where 𝑉 is greater than 𝑣. Which of the following diagrams correctly represents the reaction forces that would act when the balls collide, ignoring any objects other than the two balls?

37. Newton’s third law of motion states that whenever a pair of objects interact, the force from the first object on the second object is equal in magnitude and opposite in direction to the force of the second on the first. The two forces have equal magnitude. This option also shows the forces acting in opposite directions, as we know they should. Our answer then is option C

38. 3. Fill in the blank: For every action force, there is an equal and opposite ____ force. a. upward b. downward c. reaction d. the same direction

39. B. Analyze the following situations whether the law of interaction applied or not applied. 1. Throwing a rock into the water 2. A person leaning on the wall 3. A swimmer swimming forward 4. A man sitting on a chair 5. Boxing

40. extend Write at least 5 activities that shows action-reaction.