Transcript Energy

Energy
chapter 9
What is Energy?
Objectives:
• Standard: There are different forms of energy,
and those forms of energy can be changed
from one form to another – but total energy is
conserved.
• I will identify the different types of energy and
their characteristics as they relate to work.
• I will compare and contrast potential and
kinetic energy using a Venn Diagram.
Identify Potential and Kinetic and Explain Why
The tennis player does work and transfers energy to the
racket. With this energy, the racket can then do work on
the ball.
Process Chart
Work is done by the tennis player on the racket.
Energy moves from the ____________________
__________________ to the ______________
The tennis racket does work on the ball.
Energy moves from the ____________________
_______________ to the _______________.
• Energy
• the ability to do work
• work is the transfer of energy
• measured in joules
• power = energy transferred
time
• Kinetic
Energy
• the energy an object has due its motion
• depends on mass and velocity
• KE increases as mass increases and when velocity
increases
• KE = mass x velocity²
2
• Potential Energy
• stored energy
• has the potential to do
work
• Gravitational
Potential Energy
• PE related to an object’s
height
• GPE = weight x height
• Elastic Potential
Energy
• PE associated with objects
that can be stretched or
compressed
Wile E Coyote and the Roadrunner
• Potential Energy and Wile E Coyote
• View the video.
• Find someone at a table across the room
(opposite side of where you are located) and
discuss the types of potential energy and its
conversion shown in the video
• Return to your seat and write this down in
your own words.
Forms of Energy
• Mechanical Energy
• associated with the
position and motion of
an object
• combo of kinetic and
potential energy
• ME = PE + KE
• more ME, more work
you can do
• Thermal Energy
• total potential and kinetic
energy of particles
• faster particles move = more
KE = more thermal energy
• heat energy
• Electrical Energy
• Chemical Energy
• energy of electric charges
• can be KE or PE depending
on if it is moving or stored
• ex. lightning, batteries,
electrical lines
• PE stored in chemical bonds
• CE stored in foods, matches,
cells in your body
• Nuclear Energy
• PE stored in the nucleus of an
atom
• released during a nuclear
reaction
• ex. nuclear fission (nucleus
splits) and nuclear fusion
(nuclei fuse)
• Electromagnetic
Energy
• travels in waves
• ex. sunlight, microwaves, xrays
• Law of Conservation of
Energy
• when one form of
energy is transformed
to another, no energy is
destroyed
• energy cannot be
created nor destroyed
• ex. spinning top stops
and falls b/c mech.
energy is transformed
to thermal due to
friction
• Energy
Transformations
• change from one form of
energy to another
• single or multiple
• single – body transforms
chemical energy in food to
mechanical
• multiple – mech. used to strike
a match » thermal (friction) »
chem. (stored in match) »
thermal (heat you feel) and
electromagnetic (light you see)
Energy and Energy Transformation
• Wile E Coyote and Roadrunner
• View the video.
• Find a different partner (15 seconds) and
discuss types of energy and energy
transformation in the video
• Whole class discussion.
Alarm clock electrical energy  light and sound energy
Battery
chemical energy  electrical energy
Light bulb
electrical energy  light and thermal energy
Blender
electrical energy  kinetic and sound energy
• Combustion
• process of burning fuels
• fuel’s chem. energy is
transformed to thermal
energy
• Potential and Kinetic Energy Song
• Make a Venn Diagram of Kinetic and Potential
• Review
• Potential and Kinetic Energy Lesson