Unit 07 “Work, Power, Energy and Energy Conservation” The Conservation of Mechanical Energy Kinetic and Potential Energy.

Slides:

Advertisements

Similar presentations

Energy and its Conservation

Advertisements

Energy Chapter 5 Section 2. What is Energy? Energy – A scalar quantity that is often understood as the ability for a physical system to produce changes.

Fall Final Review WKS: WORD PROBLEMS. Average Speed 1. A rock is dropped from the top of a tall cliff 9 meters above the ground. The ball falls freely.

Conservation of Energy

Principles of Physics - Foederer. Energy is stored in a spring when work is done to compress or elongate it Compression or elongation= change in length.

Potential and Kinetic Energy Problems

CONSERVATION OF MECHANICAL ENERGY

Kinetic and Potential Energy Notes Chapter 5-2. Mechanical Kinetic Energy Amount of energy an object has based on motion Depends on the mass of the object.

Kinetic and Potential Energy

Conservation of Energy Chapter 5 Section 3. What is Conservation? When something is conserved, it is said that it remains constant. The same holds true.

Energy. Energy & Work Closely related Energy: ability to do work Work: transfer of energy Both measured in Joules.

Physics Chapter 11 Energy.

Unit 07 “Work, Power, Energy and Energy Conservation” Lab Predicting the Final Velocity of a Car Using the Conservation of Mechanical Energy.

Energy and Conservation Physics Chapter 5-2 (p ) Chapter 5-3 (p )

How much work does a 154 lb. student do when climbing a flight of stairs that are 6 meters in height and 30 meters in length? If the stairs are climbed.

P. Sci. Unit 4 Chapter 15 Energy. Energy and Work Whenever work is done, energy is transformed or transferred to another system. Energy is the ability.

Energy Chapter 5 Section 2.

Potential and Kinetic Energy. What is Energy  Energy –is the ability to do WORK!!!  Two types of energy –Potential Energy –Kinetic Energy.

Mechanical Energy. Kinetic Energy, E k Kinetic energy is the energy of an object in motion. E k = ½ mv 2 Where E k is the kinetic energy measured in J.

Energy Chapter 7.

Physical Science Chapter 15 Review Game. Energy Forms of Energy Energy ConversionsProblems 1 point 1 point 1 point 1 point 1 point 1 point 1 point 1 point.

Potential energy is the stored energy of an object.

Energy- Topic14 (I.) Forms of energy (see video “forms of energy” on my website) kinetic energy- the energy of motion thermal energy- all objects store.

Work (Pay special attention to words in BLACK) What is “Work”? According to physics… Work is a force applied for a certain distance. W=F  x.

Unit 07 “Work, Power, Energy and Energy Conservation” The Conservation of Mechanical Energy Problem Solving.

Chapter 15 Sections 1-2.  Energy is the ability to do work.  Energy is measured in Joules, just like work.

WHAT IS ENERGY?. ENERGY ENERGY: ability to do work. Whenever work is done, energy is transformed or transferred to another system. SI Units: joules (J)

Chapter 5.2. What do you think? What is meant when scientists say a quantity is conserved? Describe examples of quantities that are conserved. Are they.

P. Sci. Unit 4 Chapter 15 Energy. Energy and Work Whenever work is done, energy is transformed or transferred to another system. Energy is the ability.

Energy and Heat Table of Contents What Is Energy? Forms of Energy

Physics 11 Energy 3 – Work, Kinetic, Potential Energy Mr. Jean.

Work Kinetic Energy Work – Energy Theorem Gravitational Potential Energy Mechanical Energy Conservation of Energy Work Kinetic Energy Work – Energy Theorem.

Section 15.1Energy and Its Forms

ENERGY Chapter 12 Section 3. Warm-up Name different types of energy and their daily uses.

Section 3Work and Energy Bellringer You should already have learned that energy is always conserved. Instead of being created or destroyed, energy just.

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.

1 PPMF102 – Lecture 2 Work & Energy. 2 Work = force x displacement x cos  Work = force x displacement x cos  W = Fs cos  W = Fs cos  Scalar quantity.

Energy Conversion and Conservation by new new. Science Journal Entry 24 Define potential and kinetic energy, record their formulas, and tell how these.

Conservation of Energy (a.k.a Slacker Physics). Now, Really…Conservation of Energy In a system, energy can not be created or destroyed. Energy can change.

IB Physics 11 Mr. Jean November 3 rd, The plan: Video clips of the day Work Potential energy –Gravitational potential kinetic energy.

Lessons 10 and 12 Notes The Mousetrap Car and The Rollercoaster.

Potential energy is the stored energy of an object.

PHYSICS 103: Lecture 12 Review of Example Problems Energy and Work Agenda for Today:

ENERGY Energy cannot be created or destroyed, it can only change forms.

Unit 7: Work, Power, and Mechanical Energy.

P. Sci. Unit 4 Chapter 15 Energy.

Chapter 5.3 Review.

Energy. Energy Energy (def.) the ability to do work. Unit is Joules. Work and energy are interrelated. Work must be done on an object to get it to.

Potential and Kinetic Energy

Energy IN = Energy OUT Means ALL Energy

Nature of Energy Chapter 4.1.

Energy and its Conservation

Work-Energy Theorem Energy is the ability to do work.

What is energy? ENERGY is the ability to make things move or change

Bell Work Turn in lab Solve the following:

Science 9 Chapter 4: Energy

Please have just a sheet of paper and your calculator out

Mechanical Energy, Me (Units of joules (J))

Mechanical Energy.

Energy IN = Energy OUT Means ALL Energy

Objectives Define work in terms of energy.

Physical Science Chapter 13 Section 3

Physical Science Chapter 15 Review Game

The Nature of Energy.

Mechanical Energy.

Ch 4 Energy Kinetic Energy (KE) – the energy a moving object has because of its motion; depends on mass and speed of object KE = mv2/2 Joule – SI unit.

Ch. 4 – Energy I. Energy: The ability to cause a change!

Presentation transcript:

Unit 07 “Work, Power, Energy and Energy Conservation” The Conservation of Mechanical Energy Kinetic and Potential Energy

Kinetic Energy EquationUnits KE = ½mv 2 The Energy of Motion KE = ½(mass)x(velocity) 2 Joules (J) kgm 2 /s 2 If the object is moving it has Kinetic Energy Ask … “Is it moving?”

Potential Energy Equation The Energy of Position PE g = mgh PE g =(mass)x(gravity)x(height) Units Joules (J) kgm 2 /s 2 If the object is above the ground it has Potential Energy Ask … “Is it above the ground?”

The Law of the Conservation of Energy states that Energy can convert from one form to another form!

Quick Video Clip

To identify each type of Mechanical Energy ask the following questions: Kinetic Energy: (KE) – Is the object moving? Gravitational Potential Energy: (PE g ) – Is the object above the ground? Elastic Potential Energy: (PE e ) – Is a spring compressed or an elastic stretched out?

Identify the types of Mechanical Energy the object has at each point.

PE g (above the ground) KE (moving) PE g (above the ground) KE (moving) KE (moving)

Identify the types of Mechanical Energy the Pogo Stick has at each point.

PEePEe + KE KEPEg + KE PEgPEg + KE KE PEe + KE PEe

The Law of the Conservation of Mechanical Energy Pendulum “bob”

The Law of the Conservation of Mechanical Energy Pendulum “bob” Mechanical Energy is conserved when no dissipative forces are present. Total mechanical energy stays the same as long as there is no friction! PEg KE KE + PEg PEg = 500J

Note: Point 1 is the highest and Point 2 and 4 are “on the ground” Look at the rollercoaster below.  Identify if the rollercoaster car has Gravitational Potential Energy, Kinetic Energy or both at each point.  Fill in the table identifying the amount of kinetic and potential energy for each point.

Note: Point 1 is the highest and Point 2 and 4 are “on the ground” Look at the rollercoaster below.  Identify if the rollercoaster car has Gravitational Potential Energy, Kinetic Energy or both at each point.  Fill in the table identifying the amount of kinetic and potential energy for each point. PE g KE KE + PE g KE KE + PE g

Quick Video Clip _int_rollercoaster/ _int_rollercoaster/

Point 1Point 2Point 3Point 4Point 5 PE g 750 J600 J KE400 J ME

Point 1Point 2Point 3Point 4Point 5 PE g 750 J600 J KE400 J ME 0 J 750 J 150 J 350 J0 J 750 J 0 J 750 J

Problem #1 Calculate the potential energy of the 15kg rock at the top of a 30m high cliff.  What is the kinetic energy of the rock at the bottom of the cliff?

Problem #1 Calculate the potential energy of the 15kg rock at the top of a 30m high cliff.  What is the kinetic energy of the rock at the bottom of the cliff right before it hits the ground? PE = ? m = 15kg h = 30m PE KE PE = mgh PE = (15kg)(9.8m/s 2 )(30m) PE = 4410 J ME top = ME bottom PE top = KE bottom 4410J = KE =4410J

Problem #2 Calculate the kinetic energy of the 20kg person moving at 6m/s at the bottom of a hill.  What is the potential energy of the person at the top of the hill?

Problem #2 Calculate the kinetic energy of the 20kg person moving at 6m/s at the bottom of a hill.  What is the potential energy of the person when they come to rest at the top of the hill? KE PE KE = ? m = 20kg v = 6m/s KE = ½mv 2 KE = ½ (20kg)(6m/s) 2 KE = 360 J ME top = ME bottom KE bottom = PE top 360J = PE =360J