Law of Conservation of Energy aka First Law of Thermodynamics the first law of thermodynamics is a version of the law of conservation of energy adapted for thermodynamic systems The ID: 671063
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Slide1
Conservation of Energy Potential and Kinetic Energy Slide2
Law of Conservation of Energyaka. First Law of Thermodynamics
the
first law of thermodynamics
is a version of the
law of conservation of energy
, adapted for
thermodynamic
systems. The
law
of conservation of energy states that the total energy of an isolated system is constant;
energy can be transformed from one form to another, but cannot be created or destroyed.Slide3
TYPES OF ENERGY
Mechanical, Electromagnetic, Electrical,
Chemical and ThermalSlide4
QUIZ TIME!
What type of energy cooks food in a microwave oven?
ELECTROMAGNETIC ENERGY
What type of energy is the spinning plate inside of a microwave oven?
MECHANICAL ENERGYSlide5
QUIZ TIME!
Electrical energy is transported to your house through power lines.
When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy?
MECHANICAL ENERGYSlide6
QUIZ TIME!
What energy transformation occurs when an electric lamp is turned on?
ELECTRICAL ENERGY
ELECTROMAGNETIC ENERGYSlide7
What types of energy are shown below?
Mechanical and Thermal Energy
(
Don’t forget friction
)Slide8
What type of energy is shown below?
Chemical EnergySlide9
What type of energy is shown below?
Chemical Energy (yummy)Slide10
What type of energy is shown below?
Thermal EnergySlide11
Energy Transfer
Chemical
Electrical
Electrical
Electrical
Sound
(mechanical)
Light
(Electromagnetic)
Thermal
MechanicalSlide12
What are these for?Slide13
Potential and Kinetic EnergySlide14
How is all energy divided?
Potential
Energy
Kinetic
Energy
All Energy
Gravitation
Potential
Energy
Elastic
Potential
Energy
Chemical
Potential
EnergySlide15
What is Potential Energy?
Energy that is stored and waiting to be used laterSlide16
What is Gravitational Potential Energy?
Potential energy due to an object’s position
P.E. = mass x
height x gravity
Don’t look down, Rover!
Good boy!Slide17
What is Elastic Potential Energy?
Potential energy due compression or expansion of an elastic object.
Notice the ball compressing
and expandingSlide18
What is Chemical Potential Energy?
Potential energy stored within the chemical bonds of an objectSlide19
Solving for Potential Energy
Potential Energy
=
mass
x
gravity
x
height
E
P
or P
E
= Potential Energy
E
P
= (
m
)(
g
)(
h
)
Find the gravitational potential energy of a light that has a mass of 13.0 kg and is 4.8 m above the ground.
An apple in a tree has a gravitational potential energy of 175 J and a mass of 0.36 g. How high from the ground is the apple
?Slide20
Solving for Kinetic Energy
Kinetic Energy
=
one half
x
mass
x
velocity squared
K
E
or E
K
= Kinetic Energy
E
K
= (
1/2
)(
m
)(
V
2
)
What is the kinetic energy of a jogger with a mass of 65.0 kg traveling at a speed of 2.5 m/s?
A student is hit with a 1 kg pumpkin pie. The kinetic energy of the pie 32 J. What was the speed of the pie