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Chapter 12: Work and Energy
For this unit, we will study the concepts of work and power, as well
as the types of energy involved in doing work (potential and kinetic, as
well as other forms) and how work is done to transform that energy from
one form to another. We will look at real life scenarios and calculate the
amount of kinetic, gravitational potential energy or elastic potential
energy involved. We will also look at other forms of energy (light, sound,
thermal) and how work is done to change energy from one form to
another while conserving the total amount of energy. We will discuss the
efficiency of systems…the amount that is “lost” due to friction and how to
improve it.
There are two parts to the assessment for this unit. One is a mixed
format test….multiple choice questions, problems, short answer,
diagrams, etc. The second is a project about your wooden car. You’ll be
making some changes, re-running it, then reporting on its motion (ch
10), Forces (ch 11) and Energy (ch 12).
Vocab
+ if you’re an expert (can explain to someone else)
 if you’ve heard of it (and know a little)
0 if you’ve never heard of it
_____ work
_____
_____ power
_____
_____ Joules
_____
_____ Watts
_____
_____ simple machine
_____
_____ kinetic energy
_____
_____ gravitational
potential energy
_____ elastic potential
_____
energy
_____
_____ mechanical energy
_____
_____ sound energy
_____
_____ thermal energy
_____
_____ light energy
_____
_____ radiant energy
_____
_____ electrical energy
_____
_____ nuclear energy
_____
_____ efficiency
_____
_____ closed system
_____
_____ open system
_____
_____ Law of conservation
of energy
_____
Learning Targets (Skills):
_____ Define/calculate work, including using the correct SI units (ch 12.1)
_____ Define/calculate power, including using the correct SI units (ch 12.1)
_____ Distinguish between situations where work is being done or no work is being
Done (ch 12.1)
_____ Explain the relationship between energy and work (ch 12.3)
_____ Calculate gravitational potential energy, including using the correct SI units
(ch 12.3)
_____ Use gravitational potential energy to predict mass and height of an object
(ch 12.3)
_____ Calculate kinetic energy, including using the correct SI units (ch 12.3)
_____ Use kinetic energy to predict mass and velocity of an object (ch 12.3)
_____ Identify positions associated with maximum and minimum values of kinetic
and gravitational potential energy (ch 12.3)
_____ Solve problems involving energy transfer and conservation requiring you to use
multiple equations simultaneously (i.e. set two of the above energy
equations equal to each other and solve) (ch 12.4)
_____ Distinguish between other forms of energy besides GPE, KE and EPE (ch 12.3)
_____ Identify/describe transformations of energy for a given situation including the
work being done that causes the energy change to occur (ch 12.4)
_____ Trace a sequence of energy transformations for a given situation (ch 12.4)
_____ Explain the Law of Conservation of Energy and apply it to situations (ch 12.4)
_____ Discuss efficiency and how to improve it (ch 12.4)
_____ Identify areas where energy is “lost” and how to minimize that (ch 12.4)