AIM: How are energy Conversions and Energy conservation related?

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Presentation transcript:

AIM: How are energy Conversions and Energy conservation related?

How are energy Conversions and Energy conservation related? Identify and describe energy conversions State the law of conservation of energy Identify how the two vocabulary terms are related AIMAIM:

How are energy Conversions and Energy conservation related? ENERGY CONVERSIONS ENERGY CONSERVATIONS AIM:

AIM: What are energy conversions, etc. Rub your hands together. What type of energy is produced? Where did that energy come from? Did an energy conversion take place?

AIM: What are energy conversions, etc. What was that Energy Conversion?

AIM: What are energy conversions, etc. When I strike a tuning fork --- What type of energy is produced? Where did that energy come from? …moving your hands (mechanical) Is that an energy conversion

AIM: What are energy conversions, etc. Is that an energy conversion? What is the energy conversion?

AIM: What are energy conversions, etc.

What is an ENERGY CONVERSION? Definition #1: Energy can {and does} change form, from one type of energy to another

What is an ENERGY CONVERSION? Definition #2: Typically when energy changes from one form to another … Heat is sometimes produced as a by-product

What energy conversions exist here? Electrical to … HEAT

What energy conversions are present? Electrical … to MECHANICAL…(the motor & wind) To HEAT…

What energy conversions exist here? …Electrical to Electromagnetic (light) … with Heat…as a by-product !

What energy conversions are present?

Green plants turn the energy of the sun into ??? FOOD or Glucose Write that down! EM waves of the sun are turned into chemical energy

Glucose is a form of what type of energy ??? CHEMICAL ENERGY

What energy conversions are present? Electrical into electromagnetic - microwaves

What energy conversions exist here? Food (chemical) to energy … To physical movement by the muscles

The Chemical Energy (food) to electrical (brains and nerves) AND to mechanical (playing ball!)

AIM: What are energy conversions, etc. What does CONSERVATION mean? Main Entry: con·ser·va·tion Pronunciation: "kän(t)-s&r-'vA-sh&n Function: noun Etymology: from Latin “preservation” “to keep constant” “to not loose any of” “to save”

AIM: What are energy conversions, etc. Law of Conservation of Energy: “When energy changes from one form to another, energy is neither created nor destroyed -- but merely changes form ” “energy is neither created nor destroyed”

AIM: What are energy conversions, etc. Lets examine the match

AIM: What are energy conversions, etc. What energy conversions occur with a match? Mechanical - causes the strike

AIM: What are energy conversions, etc. The strike - creates friction Friction cause what ??? Thermal which is heat

AIM: What are energy conversions, etc. The Heat Causes … INGNITION - releases the stored chemical energy in the “match head”

AIM: What are energy conversions, etc. Burning of the chemical energy Produces light & heat!

AIM: What are energy conversions, etc. WHAT IS THIS MACHINE? What does it run on ??

AIM: What are energy conversions, etc. Solar Cell What energy conversion occurs in a solar cell? What is that called?

AIM: What are energy conversions, etc. The Solar Cell Transforms Light! Light hits the solar cell, and transforms to what?

AIM: What are energy conversions, etc. Does a calculator need a lot of Electricity? Therefore how much electricity do you think a solar cells produces ?

What is this person doing? Which ball has the greatest potential energy? Which ball has the least potential energy?

Analyze this Pendulum that means copy it in your notebook

Where is the greatest Potential energy?Label your diagram!

Analyze this Pendulum Where is the least Potential energy? Label your diagram!

Where is the least kinetic energy? Label your diagram!

Analyze this Pendulum Where is the greatest kinetic energy? Label your diagram!

Analyze this Pendulum As the pendulum moves back and forth

The type of energy amongst point 1,2,& 3 is constantly changing form What forms of energy are constantly changing in a pendulum? Potential to Kinetic and back again!

Analyze this Pendulum Will the pendulum swing for ever? N O !

What eventually causes it to stop? F R I C T I O N (air resistance)

Why? When Energy transfers form what happens ? Some of the energy is usually lost to heat (friction)

Detailed Look: Analyze this Pendulum that means copy it in your notebook

Let’s Assume the energy of this total Pendulum system equals 2

Think about the Law of Conservation of energy and how it applies to the pendulum with an energy value of 2 As pendulum moves from position to position, at any given point its total energy value will remain at 2.

WHY? Because energy is neither created nor destroyed when it changes from one form to another!

When the pendulum is just starting, all of its energy is at position #1. What is that value?

And, what was the total energy of the entire pendulum system?

What is the total energy at position #3? PE = 2

What Law tells us the total PE MUST be 2 position #3? Law of Conservation of energy

What does the Law of Conservation of Energy state ??? Energy is neither created not destroyed

So, if the P.E value of the pendulum at position #1 is 2. And if the value of the entire energy system is 2… What is the value of the Kinetic Energy at position 1?

So, if the P.E. value of the pendulum at position #3 is 2. And if the value of the entire energy system is 2… What is the value of the Kinetic Energy at position 3?

Let’s examine Position #2. What is the potential energy of #2? Position 2 has Zero potential energy

So if Position #2 has zero potential energy. But the total energy value of the system is 2 …. What must be the KE value of position #2?

What does law of conservation of energy state?. Energy is neither created nor destroyed

Could you Graph the Energy of a Pendulum Assumes the energy of the system is a “hypothetical 2”

Can you Graph a more complex example of the Pendulum A B Energy of the system is a “hypothetical 2”

AIM: What are the energy types? Worksheet Concepts 3-3, 3-4 Concept Enrichment W/S #13 PH Worksheet # 13-2 PH Enrichment # 13-2 PH Worksheet #13-1 Identify the conversions that have taken place!

Homework: INTERNET QUESTIONS FINISH WORKSHEETS AIM: What are energy conversions?