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5.3 Conservation of Energy pp. 181 -187 Mr. Richter
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Agenda Collect Progress Reports Review HW Intro to Conservation of Energy Notes: Mechanical Energy Conservation of Mechanical Energy Problem Solving with Conservation of Mechanical Energy Data Rubric
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Objectives: We Will Be Able To… Identify situations in which conservation of mechanical energy is valid. Recognize the forms that conserved energy can take. Solve problems using conservation of mechanical energy.
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Conservation of Mechanical Energy
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Mechanical Energy Mechanical energy is an umbrella term for all of the energy that is associated with movement kinetic energy – moving objects potential energy – objects that could move Mechanical energy is another way of saying the sum of the kinetic and potential energy. Non-mechanical energy (like heat, chemical, electrical, etc.) can be more difficult to model, so we deal with it separately.
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Conservation of Energy When we say conserve in everyday life, we usually mean save, or put aside. In physics, when something is conserved, it means that it is neither created or destroyed. The total amount remains the same. Like the money in the classroom.
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Conservation of Energy The total amount of energy in a system does not change. The Law of Conservation of Energy: This is only true in the absence of outside forces, like friction.
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Conservation of Energy When objects are moving upward, they lose kinetic energy but gain potential energy. Kinetic energy converts into potential energy. When objects are moving down, they lose potential energy but gain kinetic energy. Potential energy converts into kinetic energy.
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Let’s Watch a Video! http://www.youtube.com/watch?v=7K4V0NvUxRg
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Conservation of Mechanical Energy Formula Notice that the mass does not matter here. It does not make a difference, because it can be eliminated from every term.
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Problem Solving with Conservation of Energy A 3.0-kg car moving with a speed of 2.0 m/s starts up a hill. How high does the car roll before it stops? Now try with a 5.0 kg car instead!
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Wrap-Up: Did we meet our objectives? Identify situations in which conservation of mechanical energy is valid. Recognize the forms that conserved energy can take. Solve problems using conservation of mechanical energy.
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Homework p185 #2-5, p186 #2,3 Due Wed
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