Download Unit Objectives: At the completion of this unit, you should be able to

2013-2014
AP Physics
UNIT 6 – Work & Energy
Chapters 6 & 7
Unit Objectives: At the completion of this unit, you should be able to
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Understand the definition of work so you can:
o Calculate the work done by a specified constant force on a body that undergoes a specified displacement
o Relate the work done by a force to the area under a graph of force as a function of position, and calculate this
work in the case where the force is a linear function of position
o Use integration to calculate the work performed by a force F(x) on a body that undergoes a specified
displacement in one dimension
o Use the scalar product operation to calculate the work performed by a specified constant force F on a body that
undergoes a displacement in a plane
Understand the work-energy theorem so you can:
o State the theorem precisely and prove it for the case of motion in one-dimension
o Calculate the change in kinetic energy or speed that results from performing a specified amount of work
o Calculate the work performed by the net force, or by each of the forces that makes up the net force, on a body
that undergoes a specified change in speed or kinetic energy
o Apply the theorem to determine the change in a body’s kinetic energy and speed that results from the application
of specified forces, or to determine the force that is required in order to bring a body to rest in a specified
distance
Understand the concept of a conservative force so you can:
o State two alternative definitions of “conservative force” and explain why these definitions are equivalent
o Describe two examples each of conservative forces and non-conservative forces
Understand the concept of potential energy so you can:
o State the general relation between force and potential energy, and explain why potential energy can be
associated with conservative forces
o Calculate a potential energy function associated with a specified one-dimensional force F(x)
o Given the potential energy function U(x) for a one-dimensional force, calculate the magnitude and direction of
force
o Write an expression for the force exerted by an ideal spring and for the potential energy stored in a compressed
or stretched spring
o State the generalized work-energy theorem and use it to relate the work done by non-conservative forces on a
body to the changes in kinetic and potential energy of the body
Understand the concepts of mechanical energy and total energy so you can:
o State, prove and apply the relation between the work performed on a body by non-conservative forces and the
change in a body’s mechanical energy
o Describe and identify situations in which mechanical energy is converted to other forms of energy
o Analyze situations in which a body’s mechanical energy is changed by friction or a specified externally applied
force
Understand conservation of energy so you can:
o Identify situations in which mechanical energy is or is not conserved
o Apply conservation of energy in analyzing the motion of bodies that are moving in a gravitational field and are
subject to constraints imposed by strings or surfaces
o Apply conservation of energy in analyzing the motion of bodies that move under the influence of springs
o Apply the conservation of energy in analyzing the motion of bodies that move under the influence of other
specified one-dimensional forces
Understand the definition of power so you can:
o Calculate the power required to maintain the motion of a body with constant acceleration (e.g., to move a body
along a level surface, to raise a body at a constant rate, or to overcome friction for a body that is moving at a
constant speed)
o Calculate the work performed by a source that supplies constant power, or the average power supplied by a
force that performs a specified amount of work
o Prove that the relationship P  F  v follows from the definition of work, and apply this relation in analyzing
particle motion
Unit Outline:
Date
Topic/Activity
T 11/12
Day 3
W 11/13
Day 4
F 11/15
Day 1
 Systems, Work, Scalar Product Review
Assignments
 Investigation: Springs??
HW #16(due Thur., 12/2):pg.198-200
E: #1-7(odd),19,21,23,24,26,28,34,37
 Complete analysis of data
 Hooke’s Law / Work-Energy Theorem / Power
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M 11/18
Day 2
T 11/19
Day 3
W 11/20
Day 5
 Problem Session
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 Gravitational PE
 Conservative/Non-conservative Forces
 Energy Diagrams
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F 11/22
Day 1
M 11/25
Day 2
T 11/26
Day 3
W-Th 11/27-29
Early Dismissal
M 12/2
Day 4
 Problem session
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Science Drop
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HW #17(due Mon., 12/2):pg.200-04
E: #39,41,53,54
P: #63,66,75,78,81,85,86,91
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HW #18(due Tue,12/2): pg.233-39
E: #5,13,14,17,23,35,36,38,42,
43,47,55,68,75,81
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TEST – PART A (Multiple Choice)
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TEST – PART B (Free Response)
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Thanksgiving Break
 Impulse & Momentum
 Conservation of Momentum
 Test Corrections
(this session may change to a lab)
Answers to even #’d problems (from book) are on Haiku…..
Note: Subject matter for 12/2 (next unit) may change
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HW #19 (due Mon., 12/16): pg. 26870 E: #1-5,9,11,13,14,17,19,20,24,
26,28,29