The Science Duo Energy Transformations Energy Transformations The change of energy from one form to another All forms of energy and energy transformations can be traced back to the energy from the Sun Energy transformations constantly
Energy Transformations The change of energy from one form to another
All forms of energy and energy transformations can be traced back to the energy from the Sun
Energy transformations constantly occur around us
Energy is measured in units called Joules (J)
Example – A rollercoaster converts potential energy into kinetic energy as it moves down a hill Potential Kinetic<br>
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Law of Conservation of Energy Energy cannot be created or destroyed
Energy can be transformed into other forms of energy
Gravity, friction, air resistance, and other forces are often involved in energy transformations
Example – Energy is not lost while bowling. Energy is simply transferred from the ball to the pins.<br>
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Example 1 – Hair Dryer A hair dryer plugs into an outlet and uses electrical energy
Electrical energy is transformed into thermal energy and used to heat a wire coil
A small motor uses mechanical energy to move the air out of the hair dryer; the motor also generates sound energy as it works
Energy Transformations Electrical Thermal Mechanical and Sound<br>
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Example 2 – Campfire A campfire uses chemical energy stored within wood
Chemical energy is transformed into thermal energy and radiant (light) energy from the flame that is produced
Energy Transformations Chemical Thermal and Radiant<br>
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Example 3 – Nuclear Power Plant Nuclear fission (splitting an atom’s nucleus) produces thermal energy which changes water into steam
The steam is used to produce mechanical energy to spin a turbine
Mechanical energy is converted into electrical energy by a generator
Energy Transformations Nuclear Thermal Mechanical Electrical<br>
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Example 4 – Guitar A guitar requires mechanical energy from a person’s hand to run across the strings of the guitar
Mechanical energy is transformed into sound energy as the strings of the guitar begin to vibrate
Energy Transformations Mechanical Sound<br>
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Example 5 – Solar Panels Solar panels use radiant (light) energy from the Sun
Radiant energy is collected by the solar panels and converted into electrical energy
Solar panels will even generate electricity on a cloudy day
Energy Transformations Radiant Electrical<br>
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Checkpoint 5 checkpoint questions
Discuss each question with a partner
Write a complete answer to each question on your notes page<br>
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Question 1 Describe the energy transformations that occur within the Sun.<br>
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Question 2 Identify the energy transformations that occur when you rub your hands together quickly.<br>
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Question 3 Explain how Newton’s cradle demonstrates the law of conservation of energy.<br>
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Question 4 Identify 2 different objects that transform chemical energy into mechanical energy.<br>
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Question 5 Choose 1 object in the room. Describe the energy transformations that occur.<br>
