# Chapter 5 Energy and Energy Resources - PowerPoint PPT Presentation

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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

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## 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

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?

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?

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

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

Left

• Title:

• Chapter 5 Energy and Energy Resources

• On the tabs:

• Types of Energy

• Energy Conversions

• Conservation of Energy

• Energy Resources

Left

### 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

Left

### 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

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

Left

Left

### 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

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

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

Left

### Converting Fossil Fuels into Electrical Energy

Left

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

petroleum

### 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