Download 2-21-12

Warm-up Tuesday 2-21-12
1. What is the Law of Conservation of Energy?
2. Energy from the sun is ______________.
3. Fill in the chart to show energy conversions involving electrical
energy
alarm clock
electrical energy
battery
chemical energy
light bulb
electrical energy
blender
electrical energy
MYP UNIT
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MYP UNIT Question: More Than Meets the EYE!
AOI: Environments
Learner Profile: Thinker and Communicator
Essential Question: How does heat travel from one object to
another.
• Standard: S8P2. Students will be familiar with the forms and
transformations of energy.
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d. Describe how heat can be transferred through matter by the collisions
of atoms (conduction) or through space (radiation). In a liquid or gas,
currents will facilitate the transfer of heat (convection).
• Lesson Objective: Students will review the materials covering
energy, energy transformation, and heat transfer because it is
important to review material before a test.
Agenda
• Opening –
– Convection mini demonstration
• Work Session:
– Study Cards for test on Wednesday
– Test review
• Closing:
– Study Jams
Opening
• What do you think will happen to the
food coloring under the cold water?
• What do you think will happen to the
food coloring under the hot water?
Test Review Cards
• You have 15 minutes to work individually to
create test review cards.
• Using pages 242-253 make test review cards
for the upcoming test on tomorrow.
• Must have the vocabulary word, a
description, a fact, a detail, and an example.
Vocabulary for Test Review Cards
Pg. 242 - 253
• Energy
• Temperature- on PPT slide
• Mechanical
• Thermal
• Chemical
• Electrical
• Sound
• Light
• Nuclear
* Energy Transformation
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Heat
Heat Transfer
Conduction
Convection
Radiation
• Must have the vocabulary
word, a description, a
fact, a detail, and an
example.
Energy
• the “stuff” that makes
“stuff do stuff”
OR
• the ability to do work.
(W=F x D)
(F=force d=distance)
Temperature
• The measure of the average value of kinetic
energy of the molecules in random motion
What is Mechanical Energy?
o Energy due to a
object’s motion (kinetic)
or position (potential).
The bowling ball has
mechanical energy.
When the ball strikes
the pins, mechanical
energy is transferred to
the pins!
Examples of Mechanical Energy
What is Thermal Energy?
o Heat
energy
o Thermal energy is the total
kinetic energy of the particles
that make up a substance
A hot object is one whose atoms
and molecules are excited and
show rapid movement.
A cooler object's molecules and
atoms will show less movement.
What is Chemical Energy?
o Energy that is
available for release
from chemical
reactions.
The chemical bonds in
a matchstick store
energy that is
transformed into
thermal energy when
the match is struck.
Examples of Chemical Energy
What is Electrical Energy?
o Energy caused by
the movement of
electrons
o Easily transported
through power lines
and converted into
other forms of energy
What is Sound Energy?
• Sound energy is caused by an object’s
vibrations.
What is Light Energy?
• Light energy is produced by the vibrations of
electrically charged particles. Like sound
vibrations, light vibrations cause energy to be
transmitted.
Nuclear Energy
• Energy stored in
center(nucleus) of an
atom
• Fission (breaking
apart)
• Fusion (forming)
• The sun
• Most powerful
• PE only
Energy Transformations
• Most forms of energy can be transformed into
other forms.
• A change from one form of energy to another
is called an energy transformation.
• Some energy changes involve single
transformations, while others involve many
transformations.
Common Energy Transformations :Every day, energy
transformations are all around you. Some of these
transformations happen inside you!
Heat
1. Heat is the energy transferred between
objects that are at different temperatures.
2. Energy is always transferred from the object
that has the higher temperature to the one
with the lower temperature.
Heat and Thermal Energy
1. Thermal energy is the total kinetic energy of
the particles that make up a substance
2. The more particles there are in a substance
at a given, temperature, the greater the
thermal energy of the substance.
Reaching the Same Temperature
• Energy will always pass from the warmer
object to the cooler object until both have the
same temperature.
Comparison of Thermal Energy
If both glasses of
milk are at the same
temperature, the full
glass will have more
thermal energy
because it has more
potential energy.
Heat Transfer
• The transfer of thermal energy from one
object to another when they are at different
temperatures.
• There are three ways to transfer thermal
energy; conduction, convection, and radiation
Conduction
• When the particles of a material collide with
neighboring particles.
• Heat is transferred by direct contact.
Convection
• The transfer of thermal energy by the
movement of particles from one part of a
material to another.
• Heat transfer through a fluid (liquid or gas)
EX. Convection Current
• This circular motion of liquids or gases due to density
differences that result from temperature differences
is called a convection current.
Radiation
• Energy transferred by electromagnetic waves.
• Transfer of energy through empty space,
liquids, gases, or solids.
EX. Radiation and the Greenhouse Effect
1.Earth’s atmosphere acts like the windows
of a greenhouse allowing the sun’s light to
pass through but also trapping the heat
energy.
2.Greenhouse gasses like water vapor,
carbon dioxide, and methane are the
atmospheric gases that trap the heat.
Closing