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PHY221
Work, Energy, and Momentum

Overview

Purpose
The prievious modules have considered problems where the acceleration was constant (uniformly accelerated motion). If the acceleration was not constant we had to use vector calculus to solve the problem. The first part of this module will address situations where the acceleration is not constant and will use scalar concepts for solutions....the last part of the module will return to vectors and Newton's second law. We will write the second law in a form that will use net force and the time the force is applied to find changes in velocity (note that the first part of the module uses force and the distance to find changes in speed). The "new" form will be particularly useful for collisions....as in car crashes and determining how fast they "came together".

Prerequisites
o Completion of quiz 3 (70% or better)
o Completeion of Test 1 (70% or better)

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Target Learning Outcomes
 

Target Competency
5. Analyze physical problems using the concepts of work, energy, and momentum
Linked Core Abilities
A. demonstrate ability to think critically
B. solve problems
C. demonstrate effective written communication
D. apply scientific concepts
E. demonstrate essential computer skills

Performance Standards
You will demonstrate your competence:
o by applying the concepts of work, power, energy, and momentum to physical problems
o by successfully completing online quiz (at least 70%)
o by using a scientific calculator
o by using text and notes
o without a "partner"


Your performance will be successful when:
o you apply the concept of work, power, and energy to solve physical problems
o you apply the concept of momentum to solve physical problems
o you apply the concept of impulse to solve physical problems
o you apply the law of conservation of mechanical energy to physical problems
o you write relevant equations to solve a physical problem
o you apply the law of conservation of energy to solve physical problems
o you distinguish between mechanical energy, kinetic energy, and potential energy
o you distinguish between kinetic energy and momentum
o you apply conservation laws to collisions
o you calculate the center of mass of an object or system of particles

Learning Objectives
This learning plan addresses the following learning objectives to help you master the competency:
a. List the characteristics of a system
b. Define work
c. Define and calculate a vector dot product
d. calculate the angle between two vectors from the dot product
e. Define power
f. Perform back-and-forth conversions between Watt and hp
g. calculate work from a force and displacement ( vectors given in unit vector form)
h. calculate work from force and displacement (vectors given in polar form)
i. Define energy
j. Identify the units of energy , work, power, along with their "unit clusters"
k. Identify the units of momentum and impulse.
l. Define with examples potential energy and kinetic energy
m. Define elastic potential energy for a spring
n. Define with examples internal energy, potential energy, and gravitational potential energy
o. Explain what is meant by a conservation law
p. Explain Newton's law in the "impulse-momentum" form
q. State the conditions for conservation of mechanical energy
r. State and explain the law of conservation of mechanical energy
s. Define and give examples of conservative and nonconservative forces
t. Explain the relationship between conservative force and potential energy
u. Calculate the derivative of a function U(x,y,z) [the "Gradient"]
v. Determine F as the -grad U(x,y,z)
w. Define and give examples of elasic collisions
x. write mathematical models for elastic collisions (equations)
y. Define and give exmples of inelastic collisions
z. write mathematical models for inelastic collisions (equations)
aa. Define center of mass

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Learning Activities
_____1.
READ pages 182-205

_____2.
be able to REPRODUCE and EXPLAIN solutions to example problems 7.1-7.12

_____3.
SOLVE assigned problems chp 7

_____4.
READ pages 218-236 (through sec 8.5)

_____5.
be able to REPRODUCE and EXPLAIN solutions to example problems 8.1-8.10

_____6.
SOLVE assigned prob chp 8

_____7.
READ pages 252-280

_____8.
be able to REPRODUCE and EXPLAIN solutions to example problems chp 9

_____9.
SOLVE problems chp 9

_____10.
COMPLETE quiz 4 (70% or better)

_____11.
Submit Balistic Pendulum lab

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Assessment Activities
_____1.
Complete quiz4 ( 70% or better)

_____2.
Contribute meaningfully to classroom discussion

_____3.
Submit balistic pendulum activity

_____4.
Complete in class assessment (conditions with assessment)

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10/15/03
hfish@kvcc.edu
©2003