I. What are forces? A. Characteristics:
|
|
- Gladys Atkinson
- 5 years ago
- Views:
Transcription
1 Chapter 5: forces
2 I. What are forces? A. Characteristics: 1. Forces result from the interaction of objects. A FORCE is a push or a pull that one object exerts on another. 2. How are forces measured: a. in metric units Newtons (N) b. in English units pounds (lbs) (force of 1 lb = N)
3 3. Forces are VECTORS (size & direction): - have positive values (e.g. +10N) when force is directed: up/north/right/east - have negative values (e.g. -10N) when force is directed: down/south/left/west - forces can be represented in diagrams by using arrows. (length = strength) (points in direction of the force)
4 4. Forces influence motion: - have the ability to change an object s velocity (i.e. speed and direction) - Newton s Laws of Motion 5. Forces are not always noticeable: - gravity pulls object s toward earth - the ground pushes up on you
5 6. All forces are placed into TWO main categories: a. Contact Forces those that result when two objects are in direct contact w/ each other. Examples Applied Force they push or pull Tension Elastic/Spring Friction Air Resistance Normal Force
6 b. Action-through-space Forces (a.k.a. field forces create a force field ) those that result even when two objects are not in direct contact w/ each other. Examples Strong Nuclear strongest force of all Electromagnetic Weak Force related to radioactivity Gravitational
7 II. Types of Forces The Contact Forces 1. Applied Force - a force that is applied to an object by a person or another object.
8 2. Tension Force - a force that is transmitted through a string rope, cable, or wire when it is pulled tight from opposite ends - the force is directed along the entire length of the rope and pulls equally on the objects on both ends
9
10 3. Spring Force - the force exerted by a spring upon the object that is compressing or stretching the spring - The spring will push/pull back on the object w/ a force that is needed to return the compressed/stretched spring to its resting position the magnitude of the force is proportional to the amount of stretch or compression
11 Examples: A force of 16 N is required To stretch a spring a Distance of 40cm from its Rest position. What force is needed to stretch the spring: a)twice the distance 32 N b)3x the distance 48 N c) Half the distance? 8 N
12 4. Gravitational Force (a.k.a. Weight) - the force w/ which a massively large object attracts another object toward itself - all objects on earth experience the force of gravity pulling them downward toward center of the earth.
13 - on earth, gravity exerts a force of 9.8 N on every kg of mass, thus: the strength of gravity (g) = 9.8 N/kg - on the moon, the strength of gravity (g) is 1/6 that of earth (g = 1.6 N/kg)
14 - the force of gravity is equal to the weight of an object - to calculate your weight, which is the force of gravity: F gravity = m * g (weight) (where g = 9.8 N/kg) 1 kg 2 kg 3 kg W = 1(9.8) = 9.8 N W = 2(9.8) = 19.6 N W = 3(9.8) = 29.4 N
15 - DON T confuse mass and weight a. Mass the amount of matter in an object measured in kg the same everywhere in the universe b. Weight the force of gravity acting on an object s mass (i.e. related to the pull of the earth) changes depending on location
16 The Statue of Liberty has a mass of 225,000 kg. How much does she weigh? To calculate the weight of an object you have to multiply it s mass times the acceleration of gravity. Write the formula: Substitute known values: Present solution with units: W = m * g W = (225,000 kg) * 9.8 m/s² W = 2,200,000 N What the heck is 2,200,000 N? The Statue of Liberty weighs 2,207,250 Newtons, which is 495,000 lbs pounds!
17 - Example: An astronaut has a mass of 120 kg. a) what is his weight? b) what is his mass on the moon? c) what is his weight on the moon?
18 Question: Can an object have mass but no weight when that object is located on earth? YES
19 - Remember Principles of Free Fall: when objects are in free fall, gravity will accelerate them toward the earth with a speed of 9.8 m/s 2 when in free fall, an object has no weight W = 0 N weightlessness
20 5. Friction a. the force that opposes the motion of an object (i.e. acts in the opposite direction of motion). b. It results from two surfaces being pressed together
21 c. friction depends on two things: 1. types of surface in contact; due to microscopic imperfections Example: puck on sandpaper = high friction puck on ice = low friction
22 2. amount of force pressing the surfaces together (more mass, more friction) F fr F fr
23 d. Three general types of friction: - Static, Sliding, and Rolling 1. Static friction (greatest) - results when the surfaces of 2 objects are at rest; prevents an object from starting to move (static friction cancels out applied force). - eventually reach a point where applied force overcomes static friction and object will begin to move
24 2. Sliding friction - resists sliding motion of object across a dry surface - to keep an object moving, there must be another force present to overcome sliding force
25 Remember: Static friction is much stronger than sliding friction. It is much harder to start an object moving than to keep an object moving
26 3. Rolling friction: - similar to sliding friction, but applies to objects that are rolling - example: tires rolling on the ground.
27 e. Reducing friction: - Why? To decrease NRG loss (e.g. heat, noise) and to keep surfaces from wearing down. 1. Add lubricant b/n surfaces - puck slides on ice - oil in car engine 2. Reduce roughness of surfaces: - sanding wood
28 3. Ball bearings: - Two moving surfaces in a machine avoid direct contact by placing small metal balls b/n them. This way, sliding friction is changed to rolling friction.
29 4. Cushion of air or magnetic levitation: - air hockey - maglev trains
30 6. Air Resistance - the force that acts upon objects as they travel through air - most noticeable for object s traveling at high speeds (e.g. skydiver) or large surface area - usually not taken into account b/c of its negligible magnitude
31 7. Normal Force (a.k.a. support force) - the force that a surface exerts on an object that is pressing on it. - it has an equal strength and opposite direction to the force pressing the object into the surface
32 III. Forces and Equilibrium - Multiple forces are acting simultaneously on objects at all times
33 A. Free-Body Diagrams - used to show the relative magnitude and direction of all forces acting upon objects - remember: size of arrow = magnitude tip of arrow = direction of force
34 A free-body diagram illustrates the relative magnitude and direction of all forces acting upon an object. The object must be isolated and free of its surroundings lb This is a free-body diagram of the Statue of Liberty. She is represented by a simple box. The forces acting on her are labeled with a magnitude and the arrow shows direction. Notice the surrounding objects are stripped away and the forces acting on the object are shown lb
35 F W : the force of the weight of the statue. F N : the normal force, which represents the force of the pedestal pushing back up on the statue. F W = 495,000 lb F N = 495,000 lb
36 Create a free body diagram (FBD) of the gorilla: F N Gorilla F W Free Body Diagram of the Sitting Gorilla (The box represents the gorilla, W = weight of the gorilla, N = Normal force) Sitting Gorilla
37 Draw a FBD of the wooden swing: F T1 F T2 Where are the forces on the swing? Swing F W Free Body Diagram of the wooden swing (The box represents the wooden swing, W = weight of the swing and the parrot, T represents the ropes that are in tension supporting the weight) Parrot on wooden swing hung by ropes
38 Draw a FBD of bucket the bungee jumper leaped from: Where are the forces on the bucket? F T bucket F W Bungee jumping from crane Free Body Diagram of the bucket (T represents the tensile force of the cable the bucket is suspended from, and W is the weight of the diver and the bucket)
39 Draw a FBD of the ring at point C: Where are the forces on the ring? A C B F TCA F TCB D F TCD Traffic Light supported by cables Free Body Diagram of the ring at point C (T represents the force of the cables that are in tension acting on the ring)
40 Draw a FBD of the traffic light: F TCD A C B Where are the forces on the light? Light D F W Traffic Light supported by cables Free Body Diagram of the traffic light (F TCD represents the force of the cables acting on the light and F W is the weight acting on the light)
41 B. Determining Net Force: - the vector sum of all forces acting on an object is called net force - Rule: Forces that are equal in magnitude and opposite in direction will cancel out each other. Examples:
42 -Examples: Determine the net force in each of the following diagrams
43 C. Balanced v. Unbalanced Forces - when multiple forces act on an object, the net force will either be: 1. balanced (net force = zero)
44 2. unbalanced (net force is not zero)
45 What is the importance of balance and unbalanced forces? the basis of Newton s First Law of Motion 1. Balanced Forces - objects are at equilibrium - Net force = 0 and the object will be at rest or maintaining a constant motion (i.e. object has NO ACCELERATION)
46 The importance of Balance & Unbalanced forces (cont.): 1. Unbalanced Forces - Net force will be > 0 and will cause an object to change its state of motion - Cause positive/negative acceleration in which objects change their velocity - examples
47 Net force = +40 N, object will accelerate right A book is sliding across table, There is no applied force to cancel the force of friction (-5N), thus the book will begin to decelerate and slow down.
Chapter 05 Test A. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.
Class: Date: Chapter 05 Test A Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The SI unit of force preferred by scientists is the: a. kilogram. b. newton.
More informationChapter 2. Forces & Newton s Laws
Chapter 2 Forces & Newton s Laws 1st thing you need to know Everything from chapter 1 Speed formula Acceleration formula All their units There is only 1 main formula, but some equations will utilize previous
More informationPOGIL: Newton s First Law of Motion and Statics. Part 1: Net Force Model: Read the following carefully and study the diagrams that follow.
POGIL: Newton s First Law of Motion and Statics Name Purpose: To become familiar with the forces acting on an object at rest Part 1: Net Force Model: Read the following carefully and study the diagrams
More informationChapter Four Holt Physics. Forces and the Laws of Motion
Chapter Four Holt Physics Forces and the Laws of Motion Physics Force and the study of dynamics 1.Forces - a. Force - a push or a pull. It can change the motion of an object; start or stop movement; and,
More informationForces and Newton s Laws Notes
Forces and Newton s Laws Notes Force An action exerted on an object which can change the motion of the object. The SI unit for force is the Newton (N) o N = (kg m)/s 2 o Pound is also a measure of force
More informationForce in Nature. <
Force in Nature www.flickr.com/photos/nrbelex/383393596/ What is a Force? http://www.youtube.com/watch?v=seblt6kd9ey&feature=youtube_gdata_player A force
More informationCircular Motion. A car is traveling around a curve at a steady 45 mph. Is the car accelerating? A. Yes B. No
Circular Motion A car is traveling around a curve at a steady 45 mph. Is the car accelerating? A. Yes B. No Circular Motion A car is traveling around a curve at a steady 45 mph. Which vector shows the
More informationQ2. A book whose mass is 2 kg rests on a table. Find the magnitude of the force exerted by the table on the book.
AP Physics 1- Dynamics Practice Problems FACT: Inertia is the tendency of an object to resist a change in state of motion. A change in state of motion means a change in an object s velocity, therefore
More information3. What type of force is the woman applying to cart in the illustration below?
Name: Forces and Motion STUDY GUIDE Directions: Answer the following questions. 1. What is a force? a. A type of energy b. The rate at which an object performs work c. A push or a pull d. An object that
More informationDynamics; Newton s Laws of Motion
Dynamics; Newton s Laws of Motion Force A force is any kind of push or pull on an object. An object at rest needs a force to get it moving; a moving object needs a force to change its velocity. The magnitude
More informationForces. Brought to you by:
Forces Brought to you by: Objects have force because of their mass and inertia Mass is a measure of the amount of matter/particles in a substance. Mass is traditionally measured with a balance. Inertia
More informationDynamics: Forces and Newton s Laws of Motion
Lecture 7 Chapter 5 Physics I Dynamics: Forces and Newton s Laws of Motion Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsi Today we are going to discuss: Chapter 5: Force, Mass:
More informationChapter 4 Force and Motion
Chapter 4 Force and Motion Units of Chapter 4 The Concepts of Force and Net Force Inertia and Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion More on Newton s Laws:
More informationUnit 2 Part 2: Forces Note 1: Newton`s Universal Law of Gravitation. Newton`s Law of Universal Gravitation states: Gravity. Where: G = M = r =
Unit 2 Part 2: Forces Note 1: Newton`s Universal Law of Gravitation Gravity Newton`s Law of Universal Gravitation states: Where: G = = M = m = r = Ex 1: What is the force of gravity exerted on a 70.0 kg
More informationChapter 3, Section 3
Chapter 3, Section 3 3 What is force? Motion and Forces A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable. What Is a Force? A force......
More informationGeneral Physics I Spring Forces and Newton s Laws of Motion
General Physics I Spring 2011 Forces and Newton s Laws of Motion 1 Forces and Interactions The central concept in understanding why things move is force. If a tractor pushes or pulls a trailer, the tractor
More informationWhat is a Force? Free-Body diagrams. Contact vs. At-a-Distance 11/28/2016. Forces and Newton s Laws of Motion
Forces and Newton s Laws of Motion What is a Force? In generic terms: a force is a push or a pull exerted on an object that could cause one of the following to occur: A linear acceleration of the object
More informationChapter 2. Force and Newton s Laws
Chapter 2 Force and Newton s Laws 2 1 Newton s First Law Force Force A push or pull that one body exerts on another body. Examples : 2 Categories of Forces Forces Balanced Forces Unbalanced Forces Balanced
More informationAn Introduction to Forces Identifying Forces. An Introduction to Forces Forces-part 1. Forces are Interactions. What Is a Force? Identifying Forces
An Introduction to s s-part 1 Identify s,, and FBDs-KJF An Introduction to s Identifying s s are Interactions A force is an interaction between 2 objects Touching: Some forces require contact At a distance:
More information1N the force that a 100g bar of chocolate exerts on your hand.
Forces: - - > cause change in motions Newton's first law = law of inertia In absence of a net external force acting upon it, a body will either remain at rest or continue in its rectilinear uniform motion.
More informationForces I. Newtons Laws
Forces I Newtons Laws Kinematics The study of how objects move Dynamics The study of why objects move Newton s Laws and Forces What is force? What are they? Force A push or a pull Symbol is F Unit is N
More informationChapter 5 The Force Vector
Conceptual Physics/ PEP Name: Date: Chapter 5 The Force Vector Section Review 5.1 1. Indicate whether each of the following units of measurement are scalar or vector units: Speed _scalar time scalar mass
More informationPre Comp Review Questions 7 th Grade
Pre Comp Review Questions 7 th Grade Section 1 Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s second s. Temperature Kelvin K Fahrenheit
More informationChapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued Quiz 3 4.7 The Gravitational Force Newton s Law of Universal Gravitation Every particle in the universe exerts an attractive force on every other
More informationDynamics: Forces and Newton s Laws of Motion
Lecture 7 Chapter 5 Dynamics: Forces and Newton s Laws of Motion Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsi Today we are going to discuss: Chapter 5: Force, Mass: Section 5.1
More informationChapter 3: Newton s Laws of Motion
Chapter 3: Newton s Laws of Motion Mini Investigation: Predicting Forces, page 113 Answers may vary. Sample answers: A. I predicted the reading in question 3 would be the sum of the readings from questions
More informationFORCE. Definition: Combining Forces (Resultant Force)
1 FORCE Definition: A force is either push or pull. A Force is a vector quantity that means it has magnitude and direction. Force is measured in a unit called Newtons (N). Some examples of forces are:
More informationPS113 Chapter 4 Forces and Newton s laws of motion
PS113 Chapter 4 Forces and Newton s laws of motion 1 The concepts of force and mass A force is described as the push or pull between two objects There are two kinds of forces 1. Contact forces where two
More informationChapter 4. The Laws of Motion. 1. Force. 2. Newton s Laws. 3. Applications. 4. Friction
Chapter 4 The Laws of Motion 1. Force 2. Newton s Laws 3. Applications 4. Friction 1 Classical Mechanics What is classical Mechanics? Under what conditions can I use it? 2 Sir Isaac Newton 1642 1727 Formulated
More information7. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below.
1. Which statement about the movement of an object with zero acceleration is true? The object must be at rest. The object must be slowing down. The object may be speeding up. The object may be in motion.
More informationStudy Guide for Forces and Newton s Laws Test- Honors
Study Guide for Forces and Newton s Laws Test- Honors What is a force? What are the two types of forces? & What is the unit for Force? for mass? for velocity? for acceleration? What does it mean when forces
More informationChapter 5. The Laws of Motion
Chapter 5 The Laws of Motion The Laws of Motion The description of an object in There was no consideration of what might influence that motion. Two main factors need to be addressed to answer questions
More informationWhat is force? A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable.
Chapter 3, Sec-on 3 3 What is force? Motion and Forces A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable. What Is a Force? A force......
More informationUnit 2 Forces. Fundamental Forces
Lesson14.notebook July 10, 2013 Unit 2 Forces Fundamental Forces Today's goal: I can identify/name applied forces and draw appropriate free body diagrams (FBD's). There are 4 fundamental forces Gravity
More informationChapter 12 Forces and Motion
Chapter 12 Forces and Motion GOAL: Students will be able to interpret and apply Newton s three laws of motion and analyze the motion of an object in terms of its position, velocity, and acceleration. Standard:
More informationPre Comp Review Questions 8 th Grade Answers
Pre Comp Review Questions 8 th Grade Answers Section 1 Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s second s. Temperature Kelvin
More information3. The diagram shows two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart.
1. Which statement describes the gravitational force and the electrostatic force between two charged particles? A) The gravitational force may be either attractive or repulsive, whereas the electrostatic
More informationChapter 4 Forces Newton s Laws of Motion
Chapter 4 Forces Newton s Laws of Motion Forces Force A vector quantity that changes the velocity vector of an object. When you hit a baseball, the velocity of the ball changes. Can be a push or a pull
More informationForce Test Review. 1. Give two ways to increase acceleration. You can increase acceleration by decreasing mass or increasing force.
Force Test Review 1. Give two ways to increase acceleration. You can increase acceleration by decreasing mass or increasing force. 2. Define weight. The force of gravity on an object at the surface of
More informationNewton s First Law. Newton s Second Law 9/29/11
Newton s First Law Any object remains at constant velocity unless acted upon by a net force. AND In order for an object to accelerate, there must be a net force acting on it. Constant velocity could mean
More informationChapter 5 Lecture. Pearson Physics. Newton's Laws of Motion. Prepared by Chris Chiaverina Pearson Education, Inc.
Chapter 5 Lecture Pearson Physics Newton's Laws of Motion Prepared by Chris Chiaverina Chapter Contents Newton's Laws of Motion Applying Newton's Laws Friction Newton's Laws of Motion Two of the most important
More informationFree Body Diagram Practice
Name: Free Body Diagram Practice Per: Read each scenario and draw a diagram of the forces acting upon the object(s). 1. A book is at rest on a table top. Diagram the forces acting on the book. 2. A girl
More informationWhat changes in space as opposed to being on the Earth? How does this affect mass? Is the car is in equilibrium? Where will the forces act?
Quest Chapter 05 1 How would your mass change if you took a trip to the space station? 1. decreases; you weigh less. 2. increases; you weigh more. 3. no change in mass 2 (part 1 of 3) You are driving a
More information10-2: Friction, Gravity, and Elastic Forces. 8 th Grade Physical Sciences
8 th Grade Physical Sciences Purpose Students will be able to: 1. Identify factors that determine the friction force between two objects. 2. Identify the factors that affect the gravitational force between
More informationChapter 5. The Laws of Motion
Chapter 5 The Laws of Motion The Laws of Motion The description of an object in motion included its position, velocity, and acceleration. There was no consideration of what might influence that motion.
More informationCHAPTER 4 TEST REVIEW -- Answer Key
AP PHYSICS Name: Period: Date: DEVIL PHYSICS BADDEST CLASS ON CAMPUS 50 Multiple Choice 45 Single Response 5 Multi-Response Free Response 3 Short Free Response 2 Long Free Response AP EXAM CHAPTER TEST
More informationWelcome to Forces an anticipation guide A force is defined as a push or a pull When answering the following true or false statements, offer a
Welcome to Forces an anticipation guide A force is defined as a push or a pull When answering the following true or false statements, offer a real-life example that justifies your answer. You haven t answered
More informationPhysics 101 Lecture 5 Newton`s Laws
Physics 101 Lecture 5 Newton`s Laws Dr. Ali ÖVGÜN EMU Physics Department The Laws of Motion q Newton s first law q Force q Mass q Newton s second law q Newton s third law qfrictional forces q Examples
More information2.1 Force. Net Force. Net Force. Net Force
An object in mechanical equilibrium is stable, without changes in motion. Things that are in balance with one another illustrate equilibrium. Things in mechanical equilibrium are stable, without changes
More informationThe Concept of Force Newton s First Law and Inertial Frames Mass Newton s Second Law The Gravitational Force and Weight Newton s Third Law Analysis
The Laws of Motion The Concept of Force Newton s First Law and Inertial Frames Mass Newton s Second Law The Gravitational Force and Weight Newton s Third Law Analysis Models using Newton s Second Law Forces
More informationNewton s Laws. A force is simply a push or a pull. Forces are vectors; they have both size and direction.
Newton s Laws Newton s first law: An object will stay at rest or in a state of uniform motion with constant velocity, in a straight line, unless acted upon by an external force. In other words, the bodies
More informationInertia and Mass. 7. Mass and velocity values for a variety of objects are listed below. Rank the objects from smallest to greatest inertia.
Inertia and Mass Read from Lesson 1 of the Newton's Laws chapter at The Physics Classroom: http://www.physicsclassroom.com/class/newtlaws/u2l1a.html http://www.physicsclassroom.com/class/newtlaws/u2l1b.html
More informationChapter 5. Preview. Section 1 Measuring Motion. Section 2 What Is a Force? Section 3 Friction: A Force That Opposes Motion
Matter in Motion Preview Section 1 Measuring Motion Section 2 What Is a Force? Section 3 Friction: A Force That Opposes Motion Section 4 Gravity: A Force of Attraction Concept Mapping Section 1 Measuring
More information2 Mechanical Equilibrium. An object in mechanical equilibrium is stable, without changes in motion.
An object in mechanical equilibrium is stable, without changes in motion. Things that are in balance with one another illustrate equilibrium. Things in mechanical equilibrium are stable, without changes
More informationMeasuring Force You may have measured forces using a spring scale. The of the spring in the scale depends on the amount of (a type of ) acting on it.
Forces 12.1 Name 1 A is a push or a pull that on an. How do forces affect the motion of an object? Measuring Force You may have measured forces using a spring scale. The of the spring in the scale depends
More informationPhysics Chapter 4 Newton s Laws of Motion
Physics Chapter 4 Newton s Classical Mechanics Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical
More informationChapter 4. The Laws of Motion
Chapter 4 The Laws of Motion Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not
More informationForces. Net force is the combination all of the forces acting on an object. All forces have both size and direction.
Objectives Forces Describe forces, and explain how forces act on objects. Determine the net force when more than one force is acting on an object. Compare balanced and unbalanced forces. Describe ways
More informationForces. Dynamics FORCEMAN
1 Forces Dynamics FORCEMAN 2 What causes things to move? Forces What is a force? A push or a pull that one body exerts on another. 3 Balanced No change in motion 4 5 Unbalanced If the forces acting on
More informationChapter 4. Dynamics: Newton s Laws of Motion. That is, describing why objects move
Chapter 4 Dynamics: Newton s Laws of Motion That is, describing why objects move orces Newton s 1 st Law Newton s 2 nd Law Newton s 3 rd Law Examples of orces: Weight, Normal orce, Tension, riction ree-body
More informationDynamics Review Outline
Dynamics Review Outline 2.1.1-C Newton s Laws of Motion 2.1 Contact Forces First Law (Inertia) objects tend to remain in their current state of motion (at rest of moving at a constant velocity) until acted
More informationThe Laws of Motion. Gravity and Friction
The Laws of Motion Gravity and Friction Types of Forces Think about all the things you pushed or pulled today. You might have pushed toothpaste out of a tube. Maybe you pulled out a chair to sit down.
More informationFORCES AND THE LAWS OF MOTION
FORCES AND THE LAWS OF MOTION FORCE A force is the cause of an acceleration, or the change in an object s velocity (speed or direction). Forces are usually thought of as a push or a pull. The SI unit of
More informationA force is could described by its magnitude and by the direction in which it acts.
8.2.a Forces Students know a force has both direction and magnitude. P13 A force is could described by its magnitude and by the direction in which it acts. 1. Which of the following could describe the
More informationChapter 1: The Prime Movers
What is force? Chapter 1: The Prime Movers Force is a push or pull. It is a vector, meaning that it has a magnitude and direction. A vector is a physical quantity that has both magnitude and direction
More informationChapter 4. The Laws of Motion
Chapter 4 The Laws of Motion Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not
More informationThe Laws of Motion. Newton s first law Force Mass Newton s second law Newton s third law Examples
The Laws of Motion Newton s first law Force Mass Newton s second law Newton s third law Examples Isaac Newton s work represents one of the greatest contributions to science ever made by an individual.
More informationTue Sept 15. Dynamics - Newton s Laws of Motion. Forces: Identifying Forces Free-body diagram Affect on Motion
Tue Sept 15 Assignment 4 Friday Pre-class Thursday Lab - Print, do pre-lab Closed toed shoes Exam Monday Oct 5 7:15-9:15 PM email me if class conflict or extended time Dynamics - Newton s Laws of Motion
More informationForces. Unit 2. Why are forces important? In this Unit, you will learn: Key words. Previously PHYSICS 219
Previously Remember From Page 218 Forces are pushes and pulls that can move or squash objects. An object s speed is the distance it travels every second; if its speed increases, it is accelerating. Unit
More informationChapter 6 Dynamics I: Motion Along a Line
Chapter 6 Dynamics I: Motion Along a Line Chapter Goal: To learn how to solve linear force-and-motion problems. Slide 6-2 Chapter 6 Preview Slide 6-3 Chapter 6 Preview Slide 6-4 Chapter 6 Preview Slide
More informationForce - a push or a pull A force described by its strength and by the direction in which it acts The SI unit for force is the newton (N)
Forces Force - a push or a pull A force described by its strength and by the direction in which it acts The SI unit for force is the newton (N) The direction and strength of forces can be represented by
More informationForce, Friction & Gravity Notes
Force, Friction & Gravity Notes Key Terms to Know Speed: The distance traveled by an object within a certain amount of time. Speed = distance/time Velocity: Speed in a given direction Acceleration: The
More informationNewton s first and second laws
Lecture 2 Newton s first and second laws Pre-reading: KJF 4.1 to 4.7 Please log in to Socrative, room HMJPHYS1002 Recall Forces are either contact Pushes / Pulls Tension in rope Friction Normal force (virtually
More informationA N D. c h a p t e r 1 2 M O T I O N F O R C E S
F O R C E S A N D c h a p t e r 1 2 M O T I O N What is a FORCE? A FORCE is a push or pull that acts on an object. A force can cause a resting object to move OR Accelerate a moving object by: changing
More information2. If a net horizontal force of 175 N is applied to a bike whose mass is 43 kg what acceleration is produced?
Chapter Problems Newton s 2nd Law: Class Work 1. A 0.40 kg toy car moves at constant acceleration of 2.3 m/s 2. Determine the net applied force that is responsible for that acceleration. 2. If a net horizontal
More informationDo Now: Why are we required to obey the Seat- Belt law?
Do Now: Why are we required to obey the Seat- Belt law? Newton s Laws of Motion Newton s First Law An object at rest remains at rest and an object in motion remains in motion with the same speed and direction.
More informationChapter 5. The Laws of Motion
Chapter 5 The Laws of Motion Sir Isaac Newton 1642 1727 Formulated basic laws of mechanics Discovered Law of Universal Gravitation Invented form of calculus Many observations dealing with light and optics
More informationForces. A force is a push or a pull on an object
Forces Forces A force is a push or a pull on an object Arrows are used to represent forces. The direction of the arrow represent the direction the force that exist or being applied. Forces A net force
More informationHow do objects interact?
Chapter 4 FORCES Objectives You will be able to understand the idea of force categorize forces into the two main types of force recognize when forces exist Draw Free Body Diagrams (FBD) Forces So far we
More informationUNIT XX: DYNAMICS AND NEWTON S LAWS. DYNAMICS is the branch of mechanics concerned with the forces that cause motions of bodies
I. Definition of FORCE UNIT XX: DYNAMICS AND NEWTON S LAWS DYNAMICS is the branch of mechanics concerned with the forces that cause motions of bodies FORCE is a quantitative interaction between two (or
More informationPhysics 111 Lecture 4 Newton`s Laws
Physics 111 Lecture 4 Newton`s Laws Dr. Ali ÖVGÜN EMU Physics Department www.aovgun.com he Laws of Motion q Newton s first law q Force q Mass q Newton s second law q Newton s third law q Examples Isaac
More informationLecture Presentation. Chapter 4 Forces and Newton s Laws of Motion. Chapter 4 Forces and Newton s Laws of Motion. Reading Question 4.
Chapter 4 Forces and Newton s Laws of Motion Lecture Presentation Chapter 4 Forces and Newton s Laws of Motion Chapter Goal: To establish a connection between force and motion. Slide 4-2 Chapter 4 Preview
More informationExam 1 is Two Weeks away.here are some tips:
Assignment 4 due Friday like almost every Friday Pre-class due 15min before class like every class Help Room: Here, 6-9pm Wed/Thurs SI: Morton 326, M&W 7:15-8:45pm Office Hours: 204 EAL, 10-11am Wed or
More informationChapter 3 The Laws of motion. The Laws of motion
Chapter 3 The Laws of motion The Laws of motion The Concept of Force. Newton s First Law. Newton s Second Law. Newton s Third Law. Some Applications of Newton s Laws. 1 5.1 The Concept of Force Force:
More informationAn Introduction to Forces Forces-part 1. Forces are Interactions
An Introduction to Forces Forces-part 1 PHYS& 114: Eyres Forces are Interactions A force is an interaction between 2 objects Touching At a distance See the Fundamental Particle Chart (http://www.cpepphysics.org/images/2014-fund-chart.jpg)
More informationWhy constant (or straight line) motion? Remember, if an object turns at a constant speed it is accelerating.
Newton s 1st Law Newton s 1st Law of Motion - An object in constant motion will continue in constant motion or an object at rest will stay at rest unless acted upon by an unbalanced force. Unbalanced force
More informationChapter 4. The Laws of Motion. Dr. Armen Kocharian
Chapter 4 The Laws of Motion Dr. Armen Kocharian Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical
More informationNewton s First Law of Motion. Newton s Second Law of Motion. Weight 9/30/2015
Forces Newton s Three Laws of Motion Types of Forces Weight Friction Terminal Velocity Periodic Motion Forces Defined as a push or a pull Types of Forces 1) Gravitational - attractive force that exists
More informationReading Quiz. Chapter 5. Physics 111, Concordia College
Reading Quiz Chapter 5 1. The coefficient of static friction is A. smaller than the coefficient of kinetic friction. B. equal to the coefficient of kinetic friction. C. larger than the coefficient of kinetic
More information3 Friction: A Force That Opposes Motion
CHAPTER 1 SECTION Matter in Motion 3 Friction: A Force That Opposes Motion BEFORE YOU READ After you read this section, you should be able to answer these questions: What is friction? How does friction
More informationChapter FOUR: Forces in One Dimension. kew. 7 1:30 PM. force: a push or pull exerted on an object. therefore, a force causes an acceleration
Chapter FOUR: Forces in One Dimension 4.1 Force and Motion force: a push or pull exerted on an object forces cause objects to: speed up slow down change direction = change in velocity therefore, a force
More informationForces and Motion in One Dimension
Nicholas J. Giordano www.cengage.com/physics/giordano Forces and Motion in One Dimension Applications of Newton s Laws We will learn how Newton s Laws apply in various situations We will begin with motion
More informationPre-Comp Review Questions- 8 th Grade
Pre-Comp Review Questions- 8 th Grade Section 1- Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s. Temperature K Fahrenheit Length
More informationGeneral strategy for using Newton's second law to solve problems:
Chapter 4B: Applications of Newton's Laws Tuesday, September 17, 2013 10:00 PM General strategy for using Newton's second law to solve problems: 1. Draw a diagram; select a coördinate system 2. Identify
More informationA Question about free-body diagrams
Free-body Diagrams To help us understand why something moves as it does (or why it remains at rest) it is helpful to draw a free-body diagram. The free-body diagram shows the various forces that act on
More informationCh 6 Using Newton s Laws. Applications to mass, weight, friction, air resistance, and periodic motion
Ch 6 Using Newton s Laws Applications to mass, weight, friction, air resistance, and periodic motion Newton s 2 nd Law Applied Galileo hypothesized that all objects gain speed at the same rate (have the
More informationNewton s 3 Laws of Motion
Newton s 3 Laws of Motion 1. If F = 0 No change in motion 2. = ma Change in motion Fnet 3. F = F 1 on 2 2 on 1 Newton s First Law (Law of Inertia) An object will remain at rest or in a constant state of
More information1. Draw a FBD of the toy plane if it is suspended from a string while you hold the string and move across the room at a constant velocity.
1. Draw a FBD of the toy plane if it is suspended from a string while you hold the string and move across the room at a constant velocity. 2. A 15 kg bag of bananas hangs from a taunt line strung between
More informationConceptual Physics Fundamentals. Chapter 3: EQUILIBRIUM AND LINEAR MOTION
Conceptual Physics Fundamentals Chapter 3: EQUILIBRIUM AND LINEAR MOTION This lecture will help you understand: Aristotle on Motion Galileo s Concept of Inertia Mass A Measure of Inertia Net Force The
More informationChapter 5: Applications of Newton's laws Tuesday, September 17, :00 PM. General strategy for using Newton's second law to solve problems:
Ch5 Page 1 Chapter 5: Applications of Newton's laws Tuesday, September 17, 2013 10:00 PM General strategy for using Newton's second law to solve problems: 1. Draw a diagram; select a coördinate system
More information