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KINETIC ENERGY, WORK, PRINCIPLE OF
WORK AND ENERGY
Today’s Objectives
:
Students will be able to:
1.
Define the various ways a force
and couple do work.
2.
Apply the principle of work and
energy to a rigid body.
InClass Activities
:
•
Check Homework
•
Reading Quiz
•
Applications
•
Kinetic Energy
•
Work of a Force or Couple
•
Principle of Work and Energy
•
Concept Quiz
•
Group Problem Solving
•
Attention Quiz
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View Full Document READING QUIZ
1.
Kinetic energy due to rotation of the body is defined as
A) (1/2) m (v
G
)
2
.
B)
(1/2) m (v
G
)
2
+ (1/2) I
G
ϖ
2
.
C) (1/2) I
G
ϖ
2
.
D)
I
G
ϖ
2
.
2.
When calculating work done by forces, the work of an
internal force does not have to be considered because
____________.
A) internal forces do not exist
B) the forces act in equal but opposite collinear pairs
C) the body is at rest initially
D) the body can deform
APPLICATIONS
If the motor gear characteristics are known, how would you
find the rotational velocity of the mixing drum?
The work of the torque (or moment) developed by the driving
gears on the two motors on the concrete mixer is transformed
into the rotational kinetic energy of the mixing drum.
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View Full Document APPLICATIONS
(continued)
Are the kinetic energies of the frame and the roller related to
each other?
If so, how?
The work done by the soil compactor's engine is transformed
into the translational kinetic energy of the frame and the
translational and rotational kinetic energy of the roller and
wheels (excluding the internal kinetic energy developed by the
moving parts of the engine and drive train).
KINETIC ENERGY
(Section 18.1)
The kinetic energy of a rigid body can be expressed as the
sum of its translational and rotational kinetic energies.
In equation form, a body in general plane motion has
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This note was uploaded on 08/29/2010 for the course EGN 3321 taught by Professor Nohra during the Spring '10 term at University of South Florida  Tampa.
 Spring '10
 Nohra
 Dynamics

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