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Transcript
Unit 2. Energy
Big Idea:
Energy exists in different forms and can change from one form to
another, but energy is always conserved.
Essential Questions:
1.What is energy?
1.How is temperature related to kinetic energy?
1.What is the relationship between heat and temperature?
1.How does the use of energy resources affect the environment?
Monday
Tuesday
Wednesday
Thursday
Friday
MNE U2L1 DIG
LESS
COPY BULLETS
MNE U2L1 VOC
DRAW DEFINE
MNE U2L1
WORKBOOK
PAGES
MNE U2L1
CORRECT & ADD
IN RED
PEN
MNE U2L1
STUDY
POD
BALANCING
EQUATIONS
BALANCING
EQUATIONS
BALANCING
EQUATIONS
BALANCING
EQUATIONS
CW
REVIEW
SLIDES FOR
QUARTERLY 2-7
WRITING LAB
SELF CORRECT
COMPLETE LAB
TRANSFER OF
HEAT ENERGY
WATER
PROPERTIES
CONTINUED LAB
SALT WATER
INCREASING
DENSITY,
DECREASING
MELTING POINT,
LOWERING
BOILING POINT
Q
U
A
R
T
E
R
L
Y
make a list of
renewable
resources,
nonrenewable
resources, and
fossil fuels
DESIGN AND USE
TO VERIFY
ACCURACY OF A
CALORIMETER
Joules, Kelvin,
Conduction,
Convection,
Radiation and
Calorimeter
PICTURES and
Verify energy, Ke,
PE, ME,
calculation of ME
energy
transformation
drawn Kinetic
Theory of Matter,
temperature,
degree C F K for
freeezing and
bolling.
Homework
Unit 2 Lesson 1 Work, Energy, and Power
Work It Out
What is work?
• Work is the use of force to move an object some
distance.
• W=Fd
• W=mad
• W=m (change in v/change in t) d
• You do work only when you exert a force on an
object and move it.
• Work is done only by the part of the force that is
in the same direction as the motion.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 1 Work, Energy, and Power
How is work calculated?
• You can calculate the work a force does if you
know the size of the force applied to an object and
the distance over which the force acts.
• Work equals force multiplied by distance: W=F·d
• The standard unit for measuring work is either the
newton-meter (N·m) or the joule (J).
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 1 Work, Energy, and Power
Energizing
How are work and energy related?
• Energy is the ability to do work.
• Energy and work are both measured in the same
unit: the joule.
• When a person does work on an object, the
person can transfer energy to that object.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 1 Work, Energy, and Power
How are work and energy related?
• In a wind turbine, wind does work by moving the
blades so that they spin.
• Inside the turbines, more energy transfers occur
so that the energy of the blades is transformed
into electrical energy, which can be used at home.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 1 Work, Energy, and Power
Superpower
What is power?
•
•
•
•
•
•
Power is the rate at which work is done.
W=Fd
P=W/t
P=Fd/t
P=mad/t
P=m (change in velocity/change in time) d / t
• Because work is also a measure of energy
transfer, you can think of power as the rate at
which energy is converted from one form to
another.
Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 2 Lesson 1 Work, Energy, and Power
How is power calculated?
• Power can be calculated from energy and time.
• To calculate power, divide the amount of energy
used by the length of time for which it is used:
P=E/t
• Power is often measured in joules per second. The
unit of measurement for power is the watt (W).
One watt is equal to one joule of energy
transferred in one second.
Copyright © Houghton Mifflin Harcourt Publishing Company