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Transcript
```Work and Energy
Energy is transferred
when a force moves
an object.
Key Concepts
SECTION
1
Work is the use of
force to move
an object.
between force and work.
SECTION
2
Energy is transferred
when work is done.
Learn how energy is related
to work.
SECTION
3
Power is the rate at
which work is done.
Learn to calculate power
from work and energy.
Prepare and practice for
the FCAT
• Section Reviews, pp. 155,
164, 171
• Chapter Review, pp. 174–176
• FCAT Practice, p. 177
CLASSZONE.COM
• Florida Review: Content
Review and FCAT Practice
148 Unit 1: Motion and Forces
Which takes more
work, lifting a box or
holding a box? Why?
Bouncing Ball
Drop a large ball on a hard,
flat floor. Let it bounce
several times. Notice the
height the ball reaches after
each bounce.
Observe and Think
How did the height change?
Why do you think this
happens? Sketch the path of
the ball through several bounces.
Power Climbing
Walk up a flight of stairs
wearing a backpack. Run
up the same flight of stairs
wearing the backpack.
Observe and Think
Compare and contrast both
trips up the stairs. Which
one took greater effort? Did
you apply the same force
against gravity each time?
Internet Activity: Work
Go to ClassZone.com to simulate lifting weights
of different masses. Determine how much
work is done in lifting each weight by watching
work meter.
ClassZone.com
Back
Location:
Forward
Home
Images
Print
Security
Stop
http://www.classzone.com
Observe and Think
Do you think more
work will be done if
the weights are lifted
higher?
NSTA
Potential and Kinetic Energy Code: MDL007
Chapter 5: Work and Energy 149
CHAPTER 5
CONCEPT REVIEW
VOCABULARY REVIEW
• Forces change the motion of
objects in predictable ways.
velocity p. 62
force p. 81
• Velocity is a measure of
the speed and direction
of an object.
See Glossary for definitions.
energy, mass
• An unbalanced force
produces acceleration.
FLORIDA REVIEW
CLASSZONE.COM
Content Review and FCAT Practice
TAKING NOTES
MAIN IDEA WEB
Force is necessary to do work.
Joule is the unit for
measuring work.
Four Square
Definition
feature
TERM
Characteristics
TERM
feature
e
tur
fea
Magnet Word
related terms
150 Unit 1: Motion and Forces
Work depends on force
and distance.
Description
Wheel
e
tur
fea
vocabulary terms using
one or more of the
strategies from earlier
chapters—description
wheel, magnet word,
or four square. Feel free
to mix and match the
strategies or use a
different strategy.
Work = Force p distance
fea
tur
e
CHOOSE YOUR
OWN STRATEGY
Work is the use of force to
move an object.
fea
tur
e
Write each new blue