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014 Third Law & Elevators
Course: PHYSICS 20339841, Spring 2012School: Aarhus Universitet,...
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Word Count: 357
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State LO's Newton's 3rd Law Analyze forces acting on systems Aim: What is Newton's 3rd Law? Agenda Do Now Quiz Notes-3rd Law Practice Wkst Question: How do we walk? Newton's Third Law "For every action there is an EQUAL and OPPOSITE reaction. This law focuses on action/reaction pairs (forces) They NEVER cancel out All you do is SWITCH the wording! PERSON on WALL WALL on PERSON 3rd Law...
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State LO's Newton's 3rd Law Analyze forces acting on systems
Aim: What is Newton's 3rd Law?
Agenda
Do Now Quiz Notes-3rd Law Practice Wkst
Question: How do we walk?
Newton's Third Law
"For every action there is an EQUAL and OPPOSITE reaction.
This law focuses on action/reaction pairs (forces) They NEVER cancel out
All you do is SWITCH the wording! PERSON on WALL WALL on PERSON
3rd Law Examples
Action: HAMMER HITS NAIL Reaction: NAIL HITS HAMMER
Action: Earth pulls on YOU Reaction: YOU pull on the earth
3rd Law
There is a balance between the mass and acceleration. One object usually has a LARGE MASS and a SMALL ACCELERATION, while the other has a SMALL MASS (comparatively) and a LARGE ACCELERATION.
Video
http://clackhi.nclack.k12.or.us/Physics/projects/New
Cart and Horse: If the horse pulls on the cart and the cart pulls on the horse, how do they ever move forward?
LO's Explain the difference between apparent wt and wt Draw FBD for elevator
Aim: Why do we feel heavy in an elevator?
Agenda
Do Now Quiz Notes-Elevator Wkst
Homework Practice #8 Due Friday Lab due Friday (Moodle) Force Quiz on Friday
Apparent weight
If an object subject to gravity is not in free fall, then there must be a reaction force to act in opposition to gravity. We sometimes refer to this reaction force as apparent weight.
Elevator rides
When you are in an elevator, your actual weight (mg) never changes. You feel lighter or heavier during the ride because your apparent weight increases when you are accelerating up, decreases when you are accelerating down, and is equal to your weight when you are not accelerating at all.
Going Up?
v=0 a=0
v>0 a>0
Heavy feeling
v>0 a=0
v>0 a<0
Normal feeling
Normal feeling Light feeling
Wapp
Wapp
Wapp
Wapp
W Ground floor
W Just starting up
W Between floors
W Arriving at top floor
Going Down?
v=0 a=0
v<0 a<0
v<0 a=0
v<0 a>0
Heavy feeling
Normal feeling Light feeling Wapp Wapp
Normal feeling
Wapp
Wapp
W Top floor
W Beginning descent
W Between floors
W Arriving at Ground floor
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Aim: How can we use conservation of energy to predict speed or location? Objectives Understand the concepts of mechanical energy and of total energy Apply conservation of energy in analyzing the motion of systems of connected objects Apply conservation o
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
PowerOne useful application of Energy is to determine the RATE at which we store or use it. We call this application POWER! As we use this new application, we have to keep in mind all the different kinds of substitutions we can make. Unit = WATT or Horse
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Impulse and MomentumAP Physics B10/26/11 Aim: What is momentum?L.O.'s Calculate momentum and impulse Derive units for p and JAgenda 1. DNQ 2. Notes-p and JThe linear momentum p of an object of mass m with avelocity of v is p = mvIt is a vector and
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Impulse and MomentumAP Physics B10/26/11 Aim: What is momentum?L.O.'s Calculate momentum and impulse Derive units for p and JAgenda 1. DNQ 2. Notes-p and JThe linear momentum p of an object of mass m with avelocity of v is p = mvIt is a vector and
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
L.O.'s Calculate tangential velocity, ac, and FcAgenda 1. DNQ 2. Notes 3. Example ProblemsAim: How do objects travel in a circle?Circular MotionWhat is Uniform Circular Motion? .when an object moves in a circle at a constant speed. For Uniform Circu
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
L.O.'sRecognize that the motion does not Aim: depend on the object's mass Describe qualitatively how the velocity, period of revolution, and centripetal acceleration depend upon the radius of the orbit Derive expressions for the velocity and period of re
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Simple Harmonic MotionAP Physics BAim: What is simple harmonic motion?L.O.'s Sketch and interpret graphs of displacement, total energy of an oscillating system, kinetic or potential energy as a function of time, and identify points in the motion where
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
LO'sDefine volume flow rate Apply Bernoulli's equationAim: What is Bernoulli's Equation?Bernoulli's Principle & Fluid ContinuityFluid FlowUp till now, we have pretty much focused on fluids at rest. Now let's look at fluids in motion It is important t
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Thermal Physicsx AP Physics B Lecture NoteszLO'sAnalyze heat transfer and thermal expansion Calculate changes in shape to an object that has been heated Convert between Kelvin, Fahrenheit, and CelsiusAim: How do we calculate linear thermal expansion?
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
LO'sAnalyze behavior of an ideal gas List properties of an ideal gas Explain Boyles Law, Charles Law and how they relate to behavior of an ideal gasAim: What is the ideal gas law?The Kinetic Theory of GasesBehavior of an Ideal Gas: 1) large number of
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ThermodynamicsAP Physics BLO's Define heat, internal energy Calculate work done by an expanding gas Construct a PVdiagramAim: What is the difference between heat and internal energy?Agenda 1. DNQ 2. Notes 3. Example ProblemsJames Joule tests the pred
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Thermal Physicsx AP Physics B Lecture NoteszLO's1. State the connection between temperature and mean translational kinetic energy, 2. Determine the mean speed of gas molecules as a function of their mass and the temperature of the gas.Aim: How do we
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Thermodynamics, Heat Energy, and how we benefit from it.LO's 1.Calculate heat capacity of a substance 2.Compare temperature changes based on heat capacityAim: What is heat capacity?Agenda 1. DNQ 2. Notes 3. Example Problems 4. Free Response RotationRE
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ElectrostaticsLO's Describe the behavior of charged particles Describe polarization and induced charges.1/10/12 Aim: How do charges interact?Agenda 1. DNQ 2. Demo 3. Notes 4. Example ProblemsElectric Charge"Charge" is a property of subatomic particle
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ElectrostaticsLO's (1) Calculate the force on a charge due to other point charges. (2) Analyze the motion of a charge under the influence of an electrostatic force.1/13/12 Aim: What is Coulomb's Law?Agenda 1. DNQ 2. Notes 3. Example ProblemsElectric F
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ElectrostaticsLO's Draw electric field lines Calculate the strength of an electric field1/23/12 Aim: What is an Electric Field?Agenda 1. DNQ 2. Demo 3. Notes 4. Example ProblemsTest YourselfIn which direction will charges move in the diagram shown: A
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
LO'sDetermine the electric potential in the vicinity of one or more point charges Calculate the electrical work done on a charge use conservation of energy to determine the speed of a charge that moves through a specified potential difference.1/30/12 Ai
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Electric CircuitsAP Physics BAim: What is electric current and electrical resistance?LO Calculate current List factors that affect resistivity Calculate resistancePotential Difference =Voltage=EMFIn a battery, a series of chemical reactions occur i
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Magnetic Fields and ForcesAP Physics BAim: How do we calculate magnetic forces?LO's Calculate the magnitude and direction of the force in terms of q, v, and, B, Describe the paths of charged particles moving in uniform magnetic fields.Facts about Magn
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
ElectroMagnetic InductionAP Physics BAim: What is electromagnetic induction?LO's Calculate the flux of a uniform magnetic field through a loop. Recognize situations in which changing flux through a loop will cause an induced emf or current in the loop.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
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Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
1) Connect the BatteryWhich is the correct way to light the lightbulb with the battery? 4) all are correct 5) none are correct1)2)3)1) Connect the BatteryWhich is the correct way to light the lightbulb with the battery? 4) all are correct 5) none ar
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Unit 6: Electrostatics Concept Review1) Electric Charge ITwo charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? 1) one is positive, the other is negative 2) both are positive 3) both are negative
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
1) Magnetic Force IA positive charge enters a uniform magnetic field as shown. What is the direction of the magnetic force? 1) 2) 3) 4) 5) out of the page into the page downwards to the right to the leftx x x x x x v x x x x x x x x x x x x q1) Magneti
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Chapter 2Q1 Which position-versus-time graph represents the motion shown in the motion diagram?(1)(2)(3)(4)(5)Q2Which velocity-versus-time graph goes with this position-versus-time graph on the left?(1)(2)(3)(4)Q3 Which position-versus-time g
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electric Circuits Review Assignment Key Formulae:I= Q tName:V = IRVterminal = IrP = VI0108 1.2.3.0106 4.0108 5. A 12 V battery transfers 33 C of charge to an external circuit in 7.5 s. a) What current flows through the circui
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electric Circuits Review Assignment Key Formulae:I= Q tName:V = IRVterminal = IrP = VI0108 1.2.3.0106 4.0108 5. A 12 V battery transfers 33 C of charge to an external circuit in 7.5 s. a) What current flows through the circui
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electrostatics Assignment Key Formulae:F=k Q1Q2 r2Name:E=F Q V d kQ rE=kQ r2V =EP Q Q1Q2 rE=Ep = k 0108 1.V=2.3.4.0106 5.6.7.8.0101 9.10.11.12.0008 13.14.15.16.0006 17.18.19.20.0001 21.22.23.24.9908 2
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Ultimate Electrostatics Assignment Key Formulae:F=k Q1Q2 r2Name:E=F Q V d kQ rE=kQ r2V =EP Q Q1Q2 rE=Ep = k 0108 1.V=2.3.4.0106 5.6.7.8.0101 9.10.11.12.0008 13.14.15.16.0006 17.18.19.20.0001 21.22.23.24.9908 2
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Name: The Ultimate Electromagnetic Forces Assignment (9%) Key Formulae: F = BIl 0108 1. F = QvB B = 0 nI = 0N I l 2. 3. An electron travelling at 7.7 x 106 m/s enters at right angles into a uniform magnetic field.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Physics 12 Name: The Ultimate Electromagnetic Forces Assignment (9%) Key Formulae: F = BIl 0108 1. F = QvB B = 0 nI = 0N I l 2. 3. An electron travelling at 7.7 x 106 m/s enters at right angles into a uniform magnetic field.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 1: Momentum & ImpulseHow does a karate expert chop through cement blocks with a bare hand? Why does a fall onto a trampoline hurt less than onto a cement floor? Why do people in larger vehicles usually end up with fewer injuries in accidents? It's
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Test review#2 Key (advanced Kinematics) Two-body A. Yes, 472.5 > 400 B. 12.5 sec C. 25 seconds (The 20 m/s was to be considered a relative velocity) D. 2.5 sec, 2.25 sec E. 19.6 m Two Dimensional A. 63.9 m, 37.1 m/s B. 75.9 m 7.87 sec, 361.7 m, 60 m/s C.
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 5: Elastic and Inelastic CollisionsIf we are dealing with a collision involving really small objects (like atoms or molecules, things that are microscopic) you'll often find that kinetic energy is conserved. The total kinetic energy of all particl
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 6: History & Theories of Static ElectricityAncient TimesIf you ask most people who discovered electricity, they'll probably tell you Benjamin Franklin did. This is because everyone has heard the story of Franklin flying his kite during a lightnin
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 8: VelocityTwo branches in physics examine the motion of objects: Kinematics: describes the motion of objects, without looking at the cause of the motion (kinematics is the first unit of Physics 20). Dynamics: relates the motion of objects to the
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 9: Coulomb's LawCharles Augustin de CoulombBefore getting into all the hardcore physics that surrounds him, it's a good idea to understand a little about Coulomb. He was born in 1736 in Angoulme, France. He received the majority of his higher edu
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 9: d-t & v-t GraphsGraphing the motion of objects gives us a way to interpret the motion that would otherwise be difficult. Graphs will also allow you to show a large amount of information in a compact way. Essentially you need to be able to sketc
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 10: Electric FieldsJust like the force due to gravity, the force due to electric charges can act over great distances. Keep in mind that most forces we deal with in everyday life are not like this. We mostly deal with "contact forces". objects tou
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 12: GravityAristotleFrom the time of Aristotle (384-322 BC) until the late 1500's, gravity was believed to act differently on different objects. This was based on Aristotle's observations of doing things like dropping a metal bar and a feather at
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 12: Electric Potential Energy & VoltageGravitational Potential EnergyTo better understand electric potential energy it is a good idea to first review gravitational potentialenergy and figure out similarities between them. Understanding the para
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 13: Vectors in One DimensionUp to this point we have been focusing on the number crunching sort of questions you can do in physics. In this chapter the focus will start to be shifted toward more complicated problems that might notalways be solve
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 13: Voltage in a Uniform FieldMost of the time if we are doing experiments with electric fields, we use parallel plates to ensure thatthe field is uniform (the same everywhere). This carries over to our study of voltage. If we use parallel plate
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 14: Vectors in Two DimensionsTwo dimensional problems are a little tougher, because we are no longer just lining up collinear vectorsand doing quick math. Instead, we need to pay attention to how the vectors form a more complex (but not verycom
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 21: Free Body DiagramsFree Body DiagramsWe will need a way to organize forces that are acting on a particular object. The easiest way to do this isby using a free body diagram. A free body diagram is just a simple sketch of the object showing a
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 22: Net ForceThe net force is the vector sum of all the forces acting on anobject. If the forces are parallel we can just add themtogether as positive and negative forces. If the forces are at an angle we have to add them ascomponents of vect
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 23: Newton's First Law (Inertia)Newtons Laws of Motion, as written in his book the Principia, are actually very difficult to read. At the time, Newton didnt care too much about the readability of his book. He just wanted toget the stuff put down
Aarhus Universitet, Handels- og IngeniørHøjskolen - PHYSICS - 20339841
Lesson 24: Newton's Second Law (Motion)To really appreciate Newtons Laws, it sometimes helps to see how they build on each other. The First Law describes what will happen if there is no force. The Second Law describes what will happen if there is a for