Newton’s Third Law Newton’s third law of motion describes action-reaction pairs this way. When one object exerts a force on a second object, the second.

Slides:



Advertisements
Similar presentations
The Third Law of Motion Section 3.
Advertisements

3.
Newton’s 3 rd Law and Momentum. Newton’s 3 rd Law When one object exerts a force on a second object, the second object exerts a force on the first that.
Review Slide. Newton’s Second Law Newton’s Second Law Newton’s Second Law of Motion The acceleration of an object is directly proportional to the net.
For every action….. Newton’s 3rd Law.
Forces Chapter 3.
Motion & Forces Lesson 3 Action and Reaction Newton’s Third Law
Forces and Newton’s Third Law
Newton’s Third Law of Motion
Newton’s Third Law of Motion Please read pages for the first 10 min of class.
Newton’s First Law of Motion -An object moving at a constant velocity(constant speed and direction) keeps moving at that velocity unless an unbalanced.
Chapter 3—Forces.
chapter 3 – force, mass & acceleration
$200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $ 300 $400 $500 $100 $200 $300 $400 $500 $100 What is a Force? Newton’s.
Aristotle 4 th Century Natural Motion Up or down Violent Motion Pushed or pulled 2.3 Newton’s 1 st Law.
Newton’s Third Law of Motion
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 Newton’s Third Law Objectives Explain that when one object.
Newton’s Third Law. Did you know that when you push against a wall, it pushes back? No, the wall isn’t “getting pushy.” But why don’t you move the wall?
Notes: Chapter 11.3 Newton’s Third Law of Motion and Momentum.
Newton’s Third Law of Motion Chapter 3 Section 3.
Forces & Newton’s Laws Ch. 4. Forces What is a force? –Push or pull one body exerts on another –Units = Newton (N) –Examples: List all of the forces that.
Newton’s 2 nd and 3 rd Law of Motion. Newton’s 2 nd Law of Motion A net force acting on an object causes the object to accelerate in the direction of.
1 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300.
LAWS OF MOTION.
SECTION 3: Newton’s 3 rd Law and Momentum. LEARNING GOALS  State Newton’s 3 rd Law of Motion.  Identify action and reaction forces.  Calculate momentum.
Newton’s Third Law of Motion and Momentum
Chapter 3 Forces 3.3 The Third Law of Motion
April 3 rd, 2014 Homework: Study for test on Tuesday 4/8: Study Guide is online- Force packet page: 9/10 due for check in tomorrow- Read pg Do Now.
Chapter 3 Section 3 Using Newton’s Laws.
Forces Chapter 3. Section 2: Gravity What you will learn: 1. Describe the gravitational force. 2. Distinguish between mass and weight. 3. Explain why.
Chapter 3-1.
NEWTON’S THIRD LAW OF MOTION AND MOMENTUM. NEWTON’S THIRD LAW Describes action-reaction pairs When one object exerts a force on a second object, the second.
Notes: Chapter 11.3 Newton’s Third Law of Motion and Momentum.
Newton ’ s Third Law  for every action force, there is an equal and opposite reaction force.  Forces always occur in action-reaction pairs. Action-reaction.
Newton’s 3rd Law of Motion & Momentum
NEWTON’S 3 RD LAW The Third Law of Motion. NEWTON’S 3 RD LAW  For every action there is an equal and opposite reaction!
LAWS OF MOTION. Chapter Six: Laws of Motion  6.1 Newton’s First Law  6.2 Newton’s Second Law  6.3 Newton’s Third Law and Momentum.
Chapter 3. Force, Mass, and Acceleration Newton’s first law of motion states that the motion of an object changes only if an unbalanced force acts on.
A. Newton’s Laws Sir Isaac Newton (1642–1727)  able to state rules that describe the effects of forces on the motion of objects I. The First 2 Laws of.
Force Unit Part 3: Newton’s Third Law. Objectives  Be able to explain Newton’s third law in your own words and give examples  Be able to show that all.
Newton’s 3 rd Law of Motion: Momentum. Section 3: The Third Law of Motion Objectives: State Newton’s third law of motion. Identify action and reaction.
Chapter 10 Section 4 Newton’s Third Law. Newton’s Third Law of Motion Newton’s third law of motion states that if one object exerts a force on another.
3.3 Essential Questions How does Newton’s first law explain what happens in a car crash? How does Newton’s second law explain the effects of air resistance?
Force Chapter 3. Section 3.1: Newton’s Second Law Remember!!! Newton’s first law of motion an object in motion stays in motion and an object at rest stays.
OBJECTIVES 3-1 Define Newton’s second law of motion.
Chapter: The Laws of Motion
Chapter 11: Force and Newton’s Laws
Aristotle 4th Century Natural Motion Up or down Violent Motion
Motion & Forces Lesson 3 Action and Reaction Newton’s Third Law
Newton’s Laws of Motion
4.3 – Newton’s 3rd Law.
CHAPTER 3: FORCES 3.3 THE THIRD LAW OF MOTION.
The Laws of Motion The Third Law of Motion
Newton’s Third Law of Motion
Newton's Third Law of Motion and Momentum
Section 3: Using Newton’s Laws
3.3 Essential Questions How does Newton’s first law explain what happens in a car crash? How does Newton’s second law explain the effects of air resistance?
NEWTON’S LAWS 4(C) Investigate how an object’s motion changes only when a net force is applied, including activities and equipment such as toy cars, vehicle.
Section 3: Using Newton’s Laws
4.3 – Newton’s 3rd Law.
Motion & Forces Lesson 3 Action and Reaction Newton’s Third Law
Reviewing Main Ideas Forces A force is a push or pull.
The Third Law of Motion.
Physical Science Chapter 12 Section 3
Newton’s Third Law of Motion
Newton’s Third Law.
Complete the reading on Newton’s Third Law
Motion & Forces: Newton’s Laws of Motion
Section 3 Newton’s Third Law p. 360
Presentation transcript:

Newton’s Third Law Newton’s third law of motion describes action-reaction pairs this way. When one object exerts a force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction. 3.3 The Third Law of Motion

Action and Reaction When a force is applied in nature, a reaction force occurs at the same time. When you jump on a trampoline, for example, you exert a downward force on the trampoline. 3.3 The Third Law of Motion Simultaneously, the trampoline exerts an equal force upward, sending you high into the air.

Action and Reaction Forces Don’t Cancel According to the third law of motion, action and reaction forces act on different objects. Thus, even though the forces are equal, they are not balanced because they act on different objects. 3.3 The Third Law of Motion

For example, a swimmer “acts” on the water, the “reaction” of the water pushes the swimmer forward. Thus, a net force, or unbalanced force, acts on the swimmer so a change in his or her motion occurs. 3.3 The Third Law of Motion Action and Reaction Forces Don’t Cancel

Rocket Propulsion In a rocket engine, burning fuel produces hot gases. The rocket engine exerts a force on these gases and causes them to escape out the back of the rocket. By Newton’s third law, the gases exert a force on the rocket and push it forward. 3.3 The Third Law of Motion

Momentum A moving object has a property called momentum that is related to how much force is needed to change its motion. The momentum of an object is the product of its mass and velocity. 3.3 The Third Law of Motion

Momentum Momentum is given the symbol p and can be calculated with the following equation: The unit for momentum is kg · m/s. Notice that momentum has a direction because velocity has a direction. 3.3 The Third Law of Motion

Force and Changing Momentum Recall that acceleration is the difference between the initial and final velocity, divided by the time. Also, from Newton’s second law, the net force on an object equals its mass times its acceleration. 3.3 The Third Law of Motion

Force and Changing Momentum By combining these two relationships, Newton’s second law can be written in this way: 3.3 The Third Law of Motion In this equation mv f is the final momentum and mv i is the initial momentum.

Law of Conservation of Momentum The momentum of an object doesn’t change unless its mass, velocity, or both change. 3.3 The Third Law of Motion Momentum, however, can be transferred from one object to another. The law of conservation of momentum states that if a group of objects exerts forces only on each other, their total momentum doesn’t change.

When Objects Collide The results of a collision depend on the momentum of each object. 3.3 The Third Law of Motion When the first puck hits the second puck from behind, it gives the second puck momentum in the same direction.

When Objects Collide 3.3 The Third Law of Motion If the pucks are speeding toward each other with the same speed, the total momentum is zero.

3.3 Section Check Question 1 According to Newton’s law, the second object exerts a force on the first that is equal in strength and opposite in direction. According to Newton’s third law of motion, what happens when one object exerts a force on a second object? Answer

3.3 Section Check Question 2 A. mass, acceleration B. mass, velocity C. mass, weight D. net force, velocity The momentum of an object is the product of its __________ and __________.

3.3 Section Check Answer The correct answer is B. An object’s momentum is the product of its mass and velocity, and is given the symbol p.

3.3 Section Check Question 3 When two objects collide, what happens to their momentum?

3.3 Section Check Answer According to the law of conservation of momentum, if the objects in a collision exert forces only on each other, their total momentum doesn’t change, even when momentum is transferred from one object to another.