eg and ek in an energy system - zinszer...
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Eg and Ek in an Energy System
By Laura Zinszer 2016Columbia Public Schools & Physics First
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How do Egand Ekrelate in an energy system?
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As the car moves down the track, what happens to the Eg?
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As the height is lower, the Eg becomes less.
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As the car moves down the track, what happens to the Ek?
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The car speeds up, so Ekincreases!!!
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What is the car’s position on the track when the Eg = Ek?
One-half of the distance down the track.
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What happens to the Total Energy in this system?
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Total Energy = Eg + Ek
The Total Energy in a system will always remain constant!!
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As the pendulum swings, the Eg is transformed into Ek…
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but the Total Energy remains constant.
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What is the position of the pendulum when all energy is Eg?
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The pendulum is at the top and not moving.
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What is the position of the pendulum when Ek is the greatest?
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The pendulum is at the bottom of the swing and fastest!!
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What is the position of the pendulum when Eg = Ek?
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The pendulum is ½ way through the drop.
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As the coaster travels on the track, the Eg is exchanged for the Ek.
but the Total Energy of this Energy System remains constant.
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The BIG IDEA for energy isTotal Energy in the system is equal to
the Eg + Ek….
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The Total Energy in the system will always remain constant.
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TBI - Energy can not be created or
destroyed; it can only be
transformed from one type of energy form to another.
Conservation of Energy!
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In your notebook:1. What does “Conservation of Energy” actually mean to you?
2. How does a a swinging pendulum demonstrate the idea of “Conservation of Energy?”
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