Download The Law of Conservation of Energy

Name: _________________
Science of the Physical World 234
Ch. 5 Sec. 2 Outline
Conservation of Energy
Chapter 5, Section 2
(Pages 135-143)
Transforming Electrical Energy
· Light bulb: transforms _________ energy into ________
· Warmth around the bulb is evidence that some of the
__________ energy has been transformed to _________
Transforming Chemical Energy
· Gasoline stores energy in the form of _______________
_____________ energy
· Engine transforms the potential energy into _________ energy
of a moving car
· Process of converting gasoline into kinetic energy:
· 1. ____________ spark ignites ___________
· 2. The ignited fuel ________________ the chemical energy into
______________ energy
· 3. Thermal energy causes gases to _______________ and move parts
of the _______________
· 4. Car begins to move and now has ______________ energy
Conversions Between Kinetic and Potential Energy
Bicycle
Bow and Arrow
Roller Coaster
Swings
Name: _________________
Science of the Physical World 234
Ch. 5 Sec. 2 Outline
Mechanical Energy
· Total amount of _________ energy and ____________ energy in
a system
____________ Energy = Potential Energy
+ Kinetic Energy
The Law of Conservation of Energy
· “Energy cannot be ___________ or ____________, but it can be
________________ from one form to another.”
· Example: As a swing goes back and forth it is changing from
potential to kinetic energy constantly – the ______________
energy always stays the same
Is energy always conserved?
· It may seem that energy is not always ________________
· Example: coasting along a flat road on a bicycle – you will
eventually stop if you don’t petal
· If energy is conserved, why wouldn’t your kinetic energy stay constant
so that you would coast forever?
The Effect of Friction
· If the energy of an object _____________, then the energy of
another object must _____________ by the same amount
· ____________ and air _____________ cause some energy to
turn to ___________ energy
The Human Body
· Types of energy in the human body:
·
·
·
·
______________ Energy
_______________ Energy
Chemical Potential Energy
_______________ Energy
Name: _________________
Science of the Physical World 234
Ch. 5 Sec. 2 Outline
Energy Conversions in Your Body
· Body stores energy in the form of _________ and chemical
compounds
· Chemical potential energy is used to fuel processes such as
making your _________ ___________ or ______________ food
· Your body also converts energy to ___________ that is
transferred to your surroundings
· To maintain a healthy __________, you must have a proper
balance between energy contained in the food you eat and the
energy your body uses
Food Energy
· Your body is busy breaking down your lunch into ________________ that can used as
fuel
· ______________ is a unit used by nutritionists to measure how much energy you get
from various food
·
·
·
·
One calorie is equal to ________________ Joules
One gram of fat = about _________ calories
One carbohydrate = about ________calories
One grame of protein = about ________calories