Chapter 7: Newton's Third Law (Action and Reaction)

Slides:



Advertisements
Similar presentations
For every force, there is an equal and opposite force.
Advertisements

Chapter 7 Newton’s 3rd Law of Motion
Newton’s Third Law of Motion: Action and Reaction
Newton’s Second Law of Motion
Newton’s Third Law of Motion
Newton’s Third Law of Motion – Action and Reaction
Newton’s 3rd Law Whenever one object exerts a force on a second object the second object exerts a force equal in strength, BUT opposite in direction back.
Unit 4-2: Actions and Reactions. Identifying Action and Reaction Forces »Identifying action/reaction pairs is not always easy. »Try to identify the action/reaction.
For every force, there is an equal and opposite force. Newton’s 3 rd Law Notes.
Equal & Opposite Forces
Newton’s Laws of Motion Newton’s First Law of Motion.
Newton’s Third Law of Motion- Action and Reaction
Newton’s 3rd Law Part II Ch Review State Newton’s 3rd Law Let’s discuss these 3 pictures using Newton’s 3rd law. Show next time question 6-3,
Newton’s Third Law of Motion – Action and Reaction.
Forces and Newton’s Third Law
For every force, there is an equal and opposite force.
Newton’s Third Law of Motion
Newton’s third law of motion – action and reaction
Newton’s Third Law of Motion
Newton’s Third Law of Motion. Momentum.
Conceptual Physics 11th Edition
Newton’s Third Law of Motion
Physics Lesson 10 Newton’s Third Law of Motion – Action & Reaction
Newton’s Second and Third Laws
Chapter 5 Newton’s laws of motion Dr. Haykel Abdelhamid Elabidi 1 st week of November 2013/DhH/Muh 1434.
Conceptual Physics 11th Edition
Newton’s Third Law of Motion Chapter 4, Section 3 Pg
Newton's Third Law of Motion
Forces and The Laws of Motion Newton’s Second and Third Laws
Newton’s Third Law of Motion
Newton’s Third Law of Motion Action and Reaction.
Physical Science Ch. 6 Forces are part of a mutual action called INTERACTION. WHERE IS THE INTERACTION IN THIS PICTURE?
Newton’s Third Law of Motion: Action-Reaction 8SCIENCE.
For every force, there is an equal and opposite force.
Newton’s Third Law Chapter 6.
Objectives Define force as part of an interaction. (6.1)
Newton’s Laws of Motion. Newton’s First Law If the external net force on an object is zero, the object will remain at rest or continue to move at a constant.
Newton’s Second and Third Laws Chapter 4 Section 3.
Newton’s Third Law.
For every force, there is an equal and opposite force.
Newton’s Third Law of Motion In any interaction between two objects, the forces exerted are always equal in magnitude and opposite in direction. “For every.
Newton’s Third Law of Motion: Action and Reaction.
Chapter 2: Newton’s Laws of Motion 2.1 Newton’s First Law of Motion 2.2 Newton’s Second Law of Motion 2.3 Forces and Interactions 2.4 Newton’s Third Law.
For every force, there is an equal and opposite force.
7.6 The Horse-Cart Problem
Physics Section 4.3 Apply Newton’s 2nd and 3rd Law of Motion
Unit 3: Force & Newton’s Part III (Chp 6)
Newton’s 3rd law.
CHAPTER 6 NEWTON’S THIRD LAW.
Force is part of an interaction
For every force, there is an equal and opposite force.
Newton’s Laws of Motion
Motion & Force Newton’s 2nd Law of Motion
For every force, there is an equal and opposite force.
Newton’s Laws of Motion
Section 3 Newton’s Second and Third Laws
Newton’s 3rd Law of Motion
Newton’s Third Law of Motion
Newton’s Third Law of Motion
Forces and the Laws of Motion
2/24/17 Today we will identify action/reaction pairs Warm Up:
Chapter 6 – Action and Reaction
4 – 3 Newton’s 3rd Law.
Chapter 4 Force Ewen et al (2005)
Newton’s Third Law Chapter 13 Section 3 Part 3.
Newton’s Third Law Chapter 13 Section 3 Part 3.
Newton’s Third Law Chapter 13 Section 3 Part 3.
Newton’s Third Law Chapter 13 Section 3 Part 3.
Newton’s 3rd Law of Motion
Presentation transcript:

Chapter 7: Newton's Third Law (Action and Reaction)

Chapter 7: Newton’s Third Law or Motion Action and Reaction I. Forces and Interactions (7.1) A. Force is part of a mutual action– an interaction 1. Acts between one thing and another 2. Each exert a force on the other object

B. Always a pair of forces– led Newton to his third law (law of B. Always a pair of forces– led Newton to his third law (law of action and reaction)

II. Newton’s Third Law (7.2) A. Third law states: Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object

1. One force called action force and the other is called the reaction force a. It doesn’t matter which we call action or reaction force b. They are “partners” in single interaction c. Neither force exist without the other

(“To every action there is always an equal opposing reaction”) d. They are equal in strength and opposite in direction (“To every action there is always an equal opposing reaction”)

B. Without the action force there cannot be reaction force 1. Thus no resulting forward motion 2. Forces include contact and long-range forces

III. Identifying Action and Reaction (7.3) A. Identifying action and reaction pair 1. Can be difficult to identify sometimes

a. Start by identifying the interaction (e. g a. Start by identifying the interaction (e.g. Object A interacts with object B) 1). Action: Object A exerts a force on object B 2). Reaction: Object B exerts a force on object A

IV. Action and Reaction on Different Masses (7.4) A. Interaction between falling boulder and the Earth 1. Forces are equal in strength and opposite in direction a. Boulder falls to Earth b. Earth falls to boulder

2. Forces between Earth and boulder are equal, but masses not a. Newton’s second law states that acceleration is not only proportional to net force, but also inversely proportional to mass. b. Earth’s large mass– infinitesimally small acceleration

B. Cannon example 1. Interaction between cannon and cannon ball is exactly equal in magnitude and opposite in direction 2. Must consider Newton’s Second law

m Fcannonball = Fcannon F F a. Cannonball b. Cannon F m = a = a F m   b. Cannon F m F m = a = a F m F = a = a m Fcannonball = Fcannon

 V. Defining Systems (7.5) A. If action and reaction forces are internal to a system, they cancel each other and produce no acceleration of the system B. Action and reaction forces do not cancel each other when either is external to the system being considered.

VI. The Horse-Cart Problem (7.6) A. Can look at from three points of view

1. Cart system (net force exerted on cart divided by mass of cart = acceleration

2. Horse system (horse moves forward by interaction with the ground– horse pushes backwards on the ground and the ground pushes forward on the horse

3. Horse-cart system (when consider only internal forces , forces that act and react within the system, they cancel. There must be interaction with ground to produce acceleration)

Acceleration of horse-cart system due to net force of F - f

B. Stalled car example– you cannot move car forward by sitting B. Stalled car example– you cannot move car forward by sitting in car and pushing on the dashboard. Must interact with the ground-make ground push car.

VII. Action Equals Reaction (7 VII. Action Equals Reaction (7.7)– for every interaction between things, there is always a pair of oppositely directed forces that are equal in strength.