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Chapter 5 Energy and Energy Resources. Section 1 What is Energy? Section 2 Energy Conversions Section 3 Conservation of Energy Section 4 Energy Resources. Section 1 What is Energy. Right. Energy and Work: Working Together Energy is the ability to do work Kinetic Energy

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chapter 5 energy and energy resources

Chapter 5Energy and Energy Resources

Section 1 What is Energy?

Section 2 Energy Conversions

Section 3 Conservation of Energy

Section 4 Energy Resources

section 1 what is energy
Section 1 What is Energy

Right

  • Energy and Work: Working Together
    • Energy is the ability to do work
  • Kinetic Energy
    • The energy of motion

Kinetic energy = mv2

2

  • Example:
    • What is the kinetic energy of a car with a mass of 3000 kg traveling at 30 m/s?
slide3

Right

  • Potential Energy
    • Energy an object has because of position
  • Gravitational Potential Energy (GPE)
    • The energy of an object’s mass and height above the ground
    • GPE is at a maximum at the top
      • If you are on a trampoline, your GPE is at a max at the top of your jump

GPE = weight x height

  • Example Problem
    • What is the GPE of a 640 N diver standing on a platform 4 m high?
slide4

Right

  • Mechanical Energy
    • The total energy of motion and position of an object
    • Juggling a pin
    • A baseball falling through the air

Mechanical energy = potential energy+ kinetic energy

  • Example problem
    • A pin being juggled has a potential energy of 20 J and a kinetic energy of 600 J, what is the pin’s mechanical energy?
other energy forms
Other Energy Forms

Right

  • Thermal
    • Due to random motion of particles
    • Any time an energy conversion occurs, some of the original energy converts to thermal, Ex: A hairdryer
  • Chemical
    • Comes from a compound that changes as its atoms are rearranged, Ex: Energy in food
  • Electrical
    • Energy of moving electrons, Ex: An amplifier and microphone
  • Sound
    • Caused by an objects vibrations, Ex: stretch a guitar string
  • Light
    • Produced by the vibrations of electrically charged particles
  • Nuclear
    • The energy that comes from the nucleus of an atom
mini book construction
Mini Book Construction

Left

  • Title:
    • Chapter 5 Energy and Energy Resources
  • On the tabs:
    • Types of Energy
    • Energy Conversions
    • Conservation of Energy
    • Energy Resources
section 2 energy conversions
Section 2: Energy Conversions

Right

  • Energy Conversion
    • Change from one form of energy to the other
  • Elastic Potential Energy
    • The type of energy a rubber band has when you wind it on a toy airplane
    • The energy you put into stretching the rubber band
mini book construction1
Mini Book Construction
  • Tab: Energy Conversions
  • Define energy conversion, pg. 132
  • Define Elastic potential energy
  • Give 2 examples of each:
    • Conversions in Chemical Energy, pg 133
    • Conversions in Electrical Energy
  • What is the role of energy conversions in Machines? Give an example machine that converts and what does it do? (pg 137)
section 3 conservation of energy
Section 3: Conservation of Energy

Right

  • The Law of Conservation of Energy
    • After energy conversions, you end up with the same total amount of energy as the original amount of potential energy
    • Energy before = Energy after
mini book construction2
Mini Book Construction
  • Tab: Conservation of Energy, page 138
  • ____ is a force that opposes motion between two surfaces that are in contact.
  • The law of conservation of energy states that ….
  • Give 2 examples of how thermal energy is always a result of energy conversion.
  • Perpetual motion is impossible because ….
section 4 energy resources
Section 4: Energy Resources

Right

  • Nonrenewable resources cannot be replaced or are replaced more slowly than they are used up
    • Fossil Fuels: oil, natural gas, coal; formed by the buried remains of plants and animals from millions of years ago
everyday uses of some fossil fuels
Everyday uses of Some Fossil Fuels

Right

  • The US primary source of electrical energy is generated by burning fossil fuels
  • Fossil fuels are energy resources from buried remains of plants and animals that lived millions of years ago.
  • Fossil Fuels contain stored energy from the sun.
    • Concentrated forms of the sun’s energy
converting fossil fuels into electrical energy
Converting Fossil Fuels into Electrical Energy

Left

  • An electric generator converts energy of one type into another - Electric Company - Electricity

petroleum

mini book construction3
Mini Book Construction
  • Tab: Energy Resources, page
  • Create a table – Advantages and Disadvantages of Energy Resources (list one of each, Fossil Fuel-Biomass)

Non Renewable Resources

Renewable Resources

Ex. 1

Ex. 2

Ex. 3

Ex. 1

Ex. 2

Ex. 3

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