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27/08/2022
Ch. 6 Discussion Board
In YOUR OWN WORDS, discuss the idea of Intermodal Perception. How do we display this task today? (Hint: we practice some forms of this in our daily routines).No outside references needed.
Chapter 3 Discussion Topic
Based on the “core concept” for chapter 3, discuss why it is that we often hear people on the news talking about an “Energy Crisis”. In other words, why is there a crisis if “energy can neither be created or desteroyed”? What do you think energy really is?
There are certain requirements to fulfill in order to receive the maximum credit for class discussion participation.
Frequency and Timeliness: Students should post on three different days each week(day one initial post, day two response to a classmate, day three response to different classmate)
with the initial post being within 48 hours of module opening.
High-Quality posts include substantial posts containing well-developed original thoughts, added insight to the topic, outside sources, and follow-up questions. These posts are error-free and grammatically correct. In addition, these posts are a minimum of 150 words. The posts should demonstrate higher order thinking and critical thinking skills.
Chapter 3 Energy
Copyright © McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of McGraw-Hill Education.
Fundamental law:
Conservation of energy
Manifestations:
Work, motion, position, radiation (light), heat, chemical and nuclear energy, mass itself
Sources:
Petroleum, coal, moving water, nuclear, solar
Uses:
Transportation, generation of electricity, heating, cooling, lighting
Work (1)
An applied force acting through a distance parallel to the force
Work (2)
Units of work (and energy) = joule (J)
W = Fd
= (pounds) (feet)
W = Fd
= (newtons) (meters)
Work (3)
Requires movement in same direction as force
Zero distance, no work
Work (4)
Displacement perpendicular to applied force, no work
Power (1)
The rate at which work is done
Units: watts (W), horsepower (hp)
Example: Walking versus running upstairs
The “power bill” – you pay for energy
Power (2)
Motion, position and energy
Work and energy related
Energy = ability to do work
Work = process of changing energy level
Potential energy
Energy associated with position
Gravitational potential energy
Measuring h – need reference height
Also: elastic (springs) and electric (charges) potential energy
Work can change PE
Kinetic energy can change into potential energy
Kinetic energy
Energy associated with motion
Results from work or change in potential energy
Speed squared! (Double speed, KE increases by 4)
Energy forms
Mechanical energy
Kinetic plus potential energy
Chemical energy
Energy involved in chemical reactions
Radiant energy
Electromagnetic energy of light
Electrical energy
Charges, currents, etc.
Nuclear energy
Energy involving the nucleus and nuclear reactions
Energy conversion (1)
Any form of energy can be converted into another form
Energy flows from one form to another in natural processes
Example: pendulum
Energy conversion (2)
Click to edit Master text styles
Second level
Third level
Fourth level
Fifth level
Energy conservation (3)
Energy is never created or destroyed
Energy can be converted from one form to another but the total energy remains constant
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