The Work-Energy Theorem Derivation: v f 2 =v i 2 +2ad Kinematics Equation mv f 2 =mv i 2 +2madDynamics equation (1/2)[mv f 2 =mv i 2+2mad] mad= ½ mv f.

Slides:

Advertisements

Similar presentations

Honors Physics. By his power God raised the Lord from the dead, and he will raise us also. 1 Corinthians 6:14.

Advertisements

Chapter 9.6 Work-Energy Theorem

Kinetic energy. Equations The kinetic energy of a moving object is one half of the product of its mass multiplied by the square of its velocity. or.

Chapter 6: Work & Energy. THE COURSE THEME is NEWTON’S LAWS OF MOTION! Chs. 4, 5: Motion analysis with forces. NOW (Ch. 6): An alternative analysis using.

Work and Kinetic Energy Why are they clapping he did not do work.

Science w/ Ms. Hendryx 9/22/11. Velocity: m/s (distance over time) Position: m (distance) Acceleration: m/s 2 (distance over time squared) Mass: kg Force:

Dr. Jie Zou PHY 1151G Department of Physics1 Chapter 7 Work and Kinetic Energy (Continued)

Work and Kinetic Energy. Work Done by a Constant Force The definition of work, when the force is parallel to the displacement: (7-1) SI unit: newton-meter.

 E k – the energy an object has because it is moving.

Mechanical Work: More Practice. Gravitational Potential Energy: More Practice.

Dr. Jie Zou PHY 1151G Department of Physics1 Chapter 7 Work and Kinetic Energy (Continued)

Physics 111: Mechanics Lecture 6

Kinetic Energy Kinetic energy is energy of motion. Kinetic energy is a scalar quantity. KE = ½ mv 2 kinetic energy = ½ mass x (speed) 2 Units for KE are.

What factors affect the kinetic energy of a moving object?

Kinetic and Potential Energy

Kinetic energy. Equations The kinetic energy of a moving object is one half of the product of its mass multiplied by the square of its velocity. or.

Energy the ability (capacity) to do work Energy comes in many forms: mechanical, electrical, magnetic, solar, thermal, chemical, etc... thermal, chemical,

Chapter 4. The nature of energy Energy: The ability to do work or cause change All energy involves either motion or position Where are we using energy.

Kinetic Energy A moving object has energy because of its motion. This energy is called kinetic energy.

Work and Energy.

Work and Energy © 2007 The Ninja, a roller coaster at Six Flags over Georgia, has a height of 122 ft and a speed of 52 mi/h. The potential energy due.

CHS Physics Work and Kinetic Energy. WORK An external net force can cause a change in an object’s speed. An external net force can cause a change in an.

Sect. 7-4: Kinetic Energy; Work-Energy Principle.

Work and Energy Energy Chapter 5: Section 2. Learning Targets Identify several forms of energy Calculate kinetic energy for an object Distinguish between.

Momentum and Its Conservation LEQ: What is Momentum?

CHAPTER 10 WORK, ENERGY, AND POWER. STANDARDS SP3. Students will evaluate the forms and transformations of energy. a. Analyze, evaluate, and apply the.

Sub title Potential Energy Work Work- Energy Theorem Kinetic Energy Power 200 Work-Power-Energy.

Work, Kinetic Energy, and Power. v f 2 = v i 2 + 2ad and F = ma v f 2 -v i 2 = 2ad and F/m = a v f 2 -v i 2 = 2(F/m)d Fd = ½ mv f 2 – ½ mv i 2 Fd = Work.

Gravitational Potential Energy GPE – The amount of energy a mass possesses due to its position in a gravitational field. The amount of work an object.

Forms of Energy Mechanical energy is the energy possessed by an object due to its motion or its position. Radiant energy includes light, microwaves, radio.

7.4) Kinetic Energy andThe Work-Kinetic Energy Theorem Figure (7.13) - a particle of mass m moving to the right under the action of a constant net force.

Lecture 10: Work & Energy.

11/13/15 Oregon State University PH 211, Class #211 We transfer momentum to an object by exerting a net force on it during a time interval. That is, we.

Unit 8 (Chapter 10 & 11) Work, Energy and Power. Work “Work” means many things in different situations. When we talk about work in physics we are talking.

WORK, ENERGY & POWER AP Physics 1. There are many different TYPES of Energy. Energy is expressed in JOULES (J) 4.19 J = 1 calorie Energy can be expressed.

Kinetic Energy and Work. Energy Loosely defined as the ability to do work There are many types of energy, but the total energy of a system always remains.

K INETIC E NERGY AND W ORK. E NERGY Loosely defined as the ability to do work There are many types of energy, but the total energy of a system always.

5.1 Work Term ‘work’ has special meaning in science – work is done ONLY if a force moves an object. The distance an object moves ALSO must be in the same.

Kinetic Energy Energy of Motion. Kinetic Energy KE = ½ mv 2 m = mass v = speed (velocity) KE = ½ mv 2 m = mass v = speed (velocity)

Energy Transfer….. Examples of lots of Kinetic Energy.

Objectives: The student will be able to: 1. Define each type of mechanical energy and give examples of types of energy that are not mechanical. 2. State.

Work-Energy Theorem Work : W net = F net d However, we know F net = ma So work gives an object some acceleration Acceleration means the velocity changes.

Sect. 7.5: Kinetic Energy Work-Kinetic Energy Theorem.

Physics Section 5.2 Define and apply forms of mechanical energy. Energy is the ability to do work. Kinetic energy is the energy of an object due its motion.

Work, Energy and Power Kinetic Energy. Kinetic energy is the energy of motion. An object which has motion - whether it be vertical or horizontal motion.

APRIL 14 TH, 2011 Kinetic Energy. What is Kinetic Energy Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or.

Work and Energy 1.Work Energy  Work done by a constant force (scalar product)  Work done by a varying force (scalar product & integrals) 2.Kinetic Energy.

Chapter 6: Work & Energy. THE COURSE THEME is NEWTON’S LAWS OF MOTION! So Far: Motion analysis with forces. NOW : An alternative analysis using the concepts.

MOVEMENT AND CHANGE Calculating Kinetic Energy. Kinetic Energy A running elephant has more kinetic energy than a running man, because it has more mass.

Work is only done by a force on an object if the force causes the object to move in the direction of the force. Objects that are at rest may have many.

Work Work Work –Work is done on an object when a force is applied and it moves in a direction that is parallel to the force acting on it.

Energy – the ability to do work W = Fd = m a d V f 2 = V i 2 + 2a  x V f 2 - V i 2 = + 2a  x V f 2 - V i 2 = a  x 2.

PHY 151: Lecture 7A 7.1 System and Environments 7.2 Work Done by a Constant Force 7.3 Scalar Product of Two Vectors 7.4 Work Done by a Varying Force 7.5.

Energy Notes Energy is one of the most important concepts in science. An object has energy if it can produce a change in itself or in its surroundings.

Work and Kinetic Energy 1- Outline what is meant by Kinetic Energy. 2 - List different forms of energy and describe examples of the transformation of.

Alternate Definition of Work. Suppose an object is moving in a direction given by its displacement as shown. Suppose the net force is acting as shown.

Kinetic Energy Objectives: Define kinetic energy

1a i) KE = ½ x mass x speed2 1a i)

Kinetic Energy.

ENERGY The SI unit of energy is the Joule.

Energy comes in many forms: mechanical, electrical , magnetic, solar,

Work done by a Net Force A NET FORCE causes___________

Newton’s Laws.

The Kinematics Equations

Aim: How do we explain kinetic energy?

Warm-up Turn in Work Practice

(a) Find the PE at A PE = m g h = ( 500 kg )( 9.8 m/s2 )( 30 m )

Ch 8 Energy Notes ENERGY – 5.2 PPT.

Presentation transcript:

The Work-Energy Theorem Derivation: v f 2 =v i 2 +2ad Kinematics Equation mv f 2 =mv i 2 +2madDynamics equation (1/2)[mv f 2 =mv i 2+2mad] mad= ½ mv f 2 - ½ mv i 2 KE=kinetic energy = ½ mv 2 Kinetic Energy: The energy associated with the motion of a mass The amount of capable work associated with the motion of a mass. Measured in Joules (J) KE is a scalar quantity.

Kinetic Energy Considerations A small mass moving at a high speed can have the same kinetic energy (do the same work) as a large mass that travels slowly. You have two equivalent masses, mass A and B. Suppose you double the mass of A and double the speed of mass B. Which mass now has more KE? Why? A car traveling at a certain speed stops after travel a distance, d, after the brakes are applied. Suppose that the speed of the car is double, by what factor does the distance to stop change provided that the braking for is the same as the first situation.

Things for Thought A 2 g bumblebee moving at 2 m/s has a kinetic energy of 4x10 -3 J which means it is capable of doing 4x10 -3 J of work A comet with a mass of 7.9x10 11 kg traveling at 25,000 m/s has a kinetic energy or capable of doing 2.5x10 20 J of work. The most powerful atomic bomb has an energy yield of 5x10 15 J, thus this comet can do 5000 times more work.

Various Forms of the Work-Energy Theorem mad= ½ mv f 2 - ½ mv i 2 (Fnet)d=KE f -KE i KE f =final kinetic energy, KE i =initial kinetic energy Wnet=KE f – KE i Wnet=ΔKE The net work accomplished on mass causes a change in its kinetic energy. The net work accomplished on mass causes a change in its kinetic energy. The work-energy theorem is a cause and effect relationship. The net work on a mass causes a change in its kinetic energy. The work-energy theorem is a cause and effect relationship. The net work on a mass causes a change in its kinetic energy. Positive Net Work – increases the speed of a mass causing a positive change in kinetic energy. Positive Net Work – increases the speed of a mass causing a positive change in kinetic energy. Net Negative Work – decreases the speed of a mass causing a negative change in kinetic energy. Net Negative Work – decreases the speed of a mass causing a negative change in kinetic energy.