Energy. Today we will: 1.Define energy, work and the principle of conservation of energy 1.List...
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Transcript of Energy. Today we will: 1.Define energy, work and the principle of conservation of energy 1.List...
![Page 1: Energy. Today we will: 1.Define energy, work and the principle of conservation of energy 1.List different forms of energy transfer 2.Name units related.](https://reader035.fdocuments.in/reader035/viewer/2022062302/5a4d1b4b7f8b9ab0599a5a85/html5/thumbnails/1.jpg)
Energy
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Today we will:
1. Define energy, work and the principle of conservation of energy2. List different forms of energy transfer3. Name units related to energy
Key words: transform, transfer, conservation
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Starter activity
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•Ability to do work or cause change•Produces Warmth•Produces Light•Produces Sound•Produces Movement•Produces Growth•Powers Technology
What is energy?
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What is work?
Work is what something does whenever it transfers energy
from one form to another.
So a light bulb does work as it transfers energy from electrical energy to light and heat energy.
Describe work in your own words, write the answer on a mini-whiteboard
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yes , because your body is transferring energy from chemical potential to heat and kinetic (in your heart).
Are you doing work when you sit still doing nothing?
What is work?
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What is work? 0:43
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Work = force x distance moved in the direction of the force
The Work Equation
𝑊=𝐹×𝑑 (Joules)
Energy is needed for us to do work. Energy is measured in Joules, J or kilojoules, kJ.
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The work equation questionsEasy Medium Hard
Write the equation to calculate work done.
What is the work done if we apply a 1.2N force and we move 4 m in the direction of force?
Thinking about energy transfers:When you rub your hands together what are the energy transfers?
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The Principle of Conservation of Energy
This fundamental piece of science says that you cannot destroy or create energy.
(If you find a way - keep it quiet until you have taken out a patent - and you'll be a rich person!).
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People often say that you use up energy. Do you agree with this statement?
When you use energy, you are simply converting it into other forms of energy - so it is still out there it is just no longer in the nice, useful form that you had it in a moment before.
The Principle of Conservation of Energy
Energy enables work to be done. People and machines need energy supplied to do
work. Energy exists in many different forms.
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Review of your progresslist different forms of energy
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FORMS OF ENERGYPotential energy
oElastic (Rubber band, Spring)oGravitational (Weight)oChemical (fuel, food)oNuclear (atoms)
Heat/Thermal (fire, sun, candles, heater)Kinetic (running person, moving car)Electrical (electricity)Electromagnetic (fan, calling bell)Sound (speakers, headphones)
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Potential or kinetic?
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There are many different ways for energy to change its form.
We use Diagrams to show energy transfers:
http://www.eon-uk.com/EnergyExperience/708.htm
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Now, lets do some practical work
You have 30 minutes to perform you investigation into energy changes and write observations in your notebooks.
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recap
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Homework
1. What is useful and wasted energy?
2. How to calculate efficiency and power?
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Next lesson:
We will learn about work done, power, efficiencyand perform calculations
Please, bring calculators