Chapter 2: Lesson 3.

Slides:



Advertisements
Similar presentations
The Nature of Force Chapter 10 section 1.
Advertisements

Forces and Newton’s Laws. Force A force is what we call a push, or a pull, or any action that has the ability to change motion. There are two units of.
Newton’s Laws of Motion Newton’s First Law of Motion: An object at rest remains at rest and an object in motion remains in motion at constant speed and.
Newton’s Second Law of Motion Page Force and Acceleration Force is a push or a pull. Acceleration is when the motion of an object changes. Examples:
Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? –A push or a pull that one body exerts on another. 2.
Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? A push or a pull that one body exerts on another. 2.
Chapter 3 Forces.
Newton’s Second Law of Motion. Force and Acceleration Force is a push or a pull acting on an object. Acceleration occurs when the VELOCITY of an object.
Chapter 2: Lesson 3.
Chapter 12 Forces and Motion
Resistance of an object to a change in its motion inertia.
The Nature of Force Chapter 3 section 4 What is a force Force is a push or pull. Forces are either balanced or unbalanced.
Chapter 5 Newton’s 2 nd Law. We know that in order for an object at rest to move it has to have a force on it. For a moving object to stop it has to have.
Chapter 2 continuation... Tuesday, January 29 Spring 2008.
Chapter 6 Forces in Motion.
Newton’s Second Law Pages Describe your acceleration if you are in a circular motion. What is the net force of your motion? You are constantly.
Jeopardy Newton’s 1 st Law Newton’s 2 nd Law Newton’s 3 rd Law VocabularyFriction and More Final Jeopardy.
Force and Newton’s Laws. Section 1 ndtime/newtonslawsofmotion/
Forces. GPS Standards S8P3: Students will investigate the relationship between force, mass, and the motion of objects. a. Determine the relationship between.
Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? –A push or a pull that one body exerts on another. 2.
The Nature of Force and Motion 1.Force – A push or a pull – How strong it is and in what direction? 2.Net Force – The sum of all forces acting on an object.
Newton’s First & Second Laws of Motion Chp 12.2 Pg
Forces FORCEMAN.
Welcome to Who Wants to be a Millionaire
Newton’s Second Law Continued
The Laws of Motion Gravity
Newton’s Laws of Motion
Newton’s 1st Law of Motion
Force.
Forces Chapter 3.
Chapter 4 Objectives: 1) Define FORCE; including units.
NEWTON’S 2nd LAW.
Newton’s Second Law of Motion
Acceleration, Force, and Newton’s Laws
Forces and Newton’s Laws
Newton’s Second Law of Motion
Forces FORCEMAN.
Forces.
Forces and Newton’s Laws NOTES
What to do… Open your note packet to page 32
FORCE and MOTION Unit 1.
Chapter 12 Forces and Motion.
Demonstration I’m going to drop a ping pong ball and a golf ball from the same height at the same time. Which one is going to hit the desk first? What.
Forces.
Forces.
Chapter 11 Section 2.
Introduction to Circular Motion
Laws of Motion Chapter Two.
Newton’s Second Law of Motion
Newton’s Laws of Motion
FORCE and MOTION REVIEW
Newton’s First & Second Laws of Motion Chp 12.2 Pg
Unit 7 Lesson 2. Gravity: A Force of Attraction A
Newton’s Second Law of Motion
Newton’s Laws of Motion
Forces.
Measuring Forces & the First Law of Motion
Forces.
Chapter 12 Forces and Motion
Connecting Motion with Forces
Forces Review Sheet.
Forces FORCEMAN.
Forces.
When an unbalanced force acts on an object, the force: a
Rayat Shikshan Sanstha’s S. M. Joshi College, Hadapsar
Unit 15 – Forces and Motion
2.2 – Force and Mass Determine Acceleration
Free Fall October 21, 2015.
Chapter 2-3 Newton’s Second Law.
Newton’s Laws of Motion
Presentation transcript:

Chapter 2: Lesson 3

Newton’s 2nd Law of Motion The acceleration of an object is equal to the net force exerted on the object divided by the object’s mass. Force = Acceleration = The acceleration due to gravity on earth = Mass x Acceleration Force Mass 9.8 m/s2

Three Forms of Newton’s 2nd Law If you want to find… And you know… Then the formula you would use is… Acceleration (a) Net Force (F) Mass (m) Net Force (F) and mass (m) Acceleration (a) and mass (m) Net Force (F) and acceleration (a)

Units for solving for Newton’s 2nd Law Identify the information you are given Look at the units Unit for Force – Remember: is a force due to If the problem asks you to solve for weight you need to identify the acceleration due to gravity for your given location. Unit for Acceleration – Unit for Mass – Use the appropriate formula Newton (N) Weight gravity m/s2 Kg or g

Practice Problem A man has a mass of 66kg on Earth. What is his weight?

Practice Problem Johnny hits the baseball with 100N of force. The baseball has a mass of 14.2kg. Identify the acceleration of the baseball.

Practice Problem A girl on roller skates with a mass of 55kg accelerates at a rate of 2m/s2. What is her force?

Practice Problem Richie went fishing with his dad. He felt a bite on his line and started reeling the fish in with a force of 201N. The fishing line was moving at an acceleration of 22m/s2. What was the mass of the fish that he reeled in?

An object at REST Balanced Force The force exerted by the is to Unbalanced Force The force exerted by gravity is than air resistance. HAND GREATER EQUAL THE FORCE OF GRAVITY

An object in MOTION Unbalanced forces cause objects to ACCELERATE Increase Speed Decrease Speed Change Direction

Acceleration and Mass when Force remains constant. Acceleration as its mass decreases increases Acceleration as mass increases decreases Example: You are pushing a shopping cart at the grocery store. You want to push with a constant force the entire time. Without groceries you have a ________________ mass, therefore you accelerate at a _________________ rate. When you add groceries you ________________ mass and therefore acceleration ____________________. Acceleration and mass are inversely related http://www2.hawaii.edu/~kobatake/secondlaw4.html

Acceleration and Force when Mass remains constant. increases Acceleration as the force on it increases Acceleration as the force on it decreases decreases Example: If you finish your grocery shopping at the store your mass in your cart remains constant, however you want to speed up (accelerate) to get to the checkout. In order to increase my acceleration I must ________________ the amount of force applied to the cart. Acceleration and force are directly related **The acceleration is always in the as the force applied. The shopping cart moved forward because the push was in a forward direction same direction

We know that objects with different masses accelerate to the ground However, because of the 2nd Law we know that they don’t hit the ground with the same at the same rate. force. F = ma 98 N = 10 kg x 9.8 m/s/s F = ma 9.8 N = 1 kg x 9.8 m/s/s

Newton’s second law explains why objects fall to Earth with the same acceleration (9.8 m/s) Less mass Less Gravitational force Less inertia = easier to move More mass More Gravitational force More inertia = harder to move

Constant Type of Relationship Force Mass Increases Acceleration ________ Mass ___________ Acceleration Increases Mass Force Increases Force ____________ Acceleration Decreases Acceleration Mass Decreases Decreases Inverse Decreases Increases Direct Decreases Increases Direct Decreases

Newton’s Laws can be applied to objects moving in circular motion.

Circular Motion Any motion in which an object is moving along a curved path. For example: A rider on a merry-go-round moves in a circle. This type of motion is called If you are in circular motion, your of motion is constantly This means you are constantly Circular motion direction changing accelerating

Centripetal Force The inward force on a spinning object that stops it from going in a straight line.

All requires a Because the force acts toward the of the circular path, the acceleration must also be toward the CIRCULAR MOTION CENTRIPETAL FORCE CENTER CENTER

Answer the following with your partner. Use the diagram to answer each question. What force keeps the ball moving in a circle? What is producing this force? Why is the ball accelerating? In which direction is it accelerating? If the ball broke away from the string at the position shown, would it move away on line A, B, or C? What causes it to take this path? After breaking away from the string, what is the main force that would be acting on the ball?