AIM: How are energy Conversions and Energy conservation related?

1
AIM How are energy Conversions and Energy
conservation related?

2
How are energy Conversions
and Energy conservation related?
AIM
Objectives
Identify and describe energy conversions State
the law of conservation of energy Identify how
the two vocabulary terms are related
3
How are energy Conversions
and Energy conservation related?
AIM
Vocabulary
ENERGY CONVERSIONS ENERGY CONSERVATIONS
4
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.
Y E S !
5
What was that Energy Conversion?
Mechanical to Thermal
AIM What are energy conversions, etc.
6
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.
Y E S !
7
AIM What are energy conversions, etc.
Is that an energy conversion? What is the
energy conversion?
8
AIM What are energy conversions, etc.

Mechanical (the stretch) to Potential
9
What is an ENERGY CONVERSION? Definition 1
Energy can and does change form, from one
type of energy to another
AIM What are energy conversions, etc.
10
What is an ENERGY CONVERSION? Definition 2
Typically when energy changes from one form to
another Heat is sometimes produced as a
by-product
11
What energy conversions exist here? Electrical to
HEAT
12
What energy conversions are present? Electrical
to MECHANICAL(the motor wind) To HEAT
13
What energy conversions exist here? Electrical
to Electromagnetic (light) with Heatas a
by-product !
14
What energy conversions are present?
15
Write that down!
EM waves of the sun are turned into chemical
energy
Green plants turn the energy of the sun into ???
FOOD or Glucose
16
Glucose is a form of what type of energy ???
CHEMICAL ENERGY
17
What energy conversions are present? Electrical
into electromagnetic - microwaves
18
What energy conversions exist here? Food
(chemical) to energy To physical movement by
the muscles
19
The Chemical Energy (food) to electrical (brains
and nerves) AND to mechanical (playing ball!)
20
What does CONSERVATION mean? Main Entry
conservation Pronunciation
"kän(t)-sr-'vA-shnFunction noun Etymology
from Latin preservation to keep constant to
not loose any of to save
AIM What are energy conversions, etc.
21
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.
22

AIM What are energy conversions, etc.
Lets examine the match
23

What energy conversions occur with a
match? Mechanical - causes the strike
AIM What are energy conversions, etc.
24

The strike - creates friction Friction cause
what ??? Thermal which is heat
AIM What are energy conversions, etc.
25

The Heat Causes INGNITION - releases the
stored chemical energy in the match head
AIM What are energy conversions, etc.
26

Burning of the chemical energy Produces light
heat!
AIM What are energy conversions, etc.
27

AIM What are energy conversions, etc.
WHAT IS THIS MACHINE? What does it run on ??
28

AIM What are energy conversions, etc.
What is that called?
Solar Cell What energy conversion occurs in a
solar cell?
29

• The Solar Cell
• Transforms Light!
• Light hits the solar cell, and transforms to
  what?

AIM What are energy conversions, etc.
Electricity
30

• Does a calculator need a lot of Electricity?
• Therefore how much electricity do you think a
  solar cells produces ?

AIM What are energy conversions, etc.
31
What is this person doing? Which ball has the
greatest potential energy? Which ball has the
least potential energy?
32
Analyze this Pendulum
that means copy it in your notebook
33
Where is the greatest Potential energy?Label your
diagram!
34
Where is the greatest Potential energy?Label your
diagram!
35
Analyze this PendulumWhere is the least
Potential energy? Label your diagram!
36
Where is the least kinetic energy? Label your
diagram!
37
Where is the least kinetic energy? Label your
diagram!
38
Analyze this PendulumWhere is the greatest
kinetic energy? Label your diagram!
39
(No Transcript)
40
Analyze this PendulumAs the pendulum moves back
and forth
41
The type of energy amongst point 1,2, 3 is
constantly changing form
Potential to Kinetic and back again!
What forms of energy are constantly changing in a
pendulum?
42
Analyze this PendulumWill the pendulum swing for
ever?
N O !
43
What eventually causes it to stop?
F R I C T I O N (air resistance)
44
Why?When Energy transfers form what happens ?
Some of the energy is usually lost to heat
(friction)
45
Detailed Look Analyze this Pendulum
that means copy it in your notebook
46
Lets Assume the energy of this total Pendulum
system equals 2
47
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.
48
WHY?Because energy is neither created nor
destroyed when it changes from one form to
another!
49
When the pendulum is just starting, all of its
energy is at position 1. What is that value?
P.E. 2
50
And, what was the total energy of the entire
pendulum system?
Also 2
51
What is the total energy at position 3?
PE 2
52
What Law tells us the total PE MUST be 2
position 3?
Law of Conservation of energy
53
What does the Law of Conservation of Energy
state ???
Energy is neither created not destroyed
54
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?
K.E. ZERO
55
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?
K.E. ZERO
56
Lets examine Position 2.What is the potential
energy of 2?
Position 2 has Zero potential energy
57
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?
K.E. 2
58
What does law of conservation of energy state?.
Energy is neither created nor destroyed
59
Could you Graph the Energy of a Pendulum
Assumes the energy of the system is a
hypothetical 2
60
Can you Graph a more complex example of the
Pendulum
1
3
B
A
2
Energy of the system is a hypothetical 2
61
Class Activity
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!
AIM What are the energy types?
62

• Homework
• INTERNET QUESTIONS
• FINISH WORKSHEETS

AIM What are energy conversions?
63
(No Transcript)