Lectures 15 & 16 - Energy and Kinetic Energy

Lectures 15 & 16 - Energy and Kinetic Energy -...

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    Energy and Energy Transfer Chapter 7
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    Introduction to Energy The concept of energy is one of the  most important topics in science Every physical process that occurs in  the Universe involves energy and  energy transfers or transformations Energy is not easily defined
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    The energy approach to describing  motion is particularly useful when the  force is not constant An approach will involve  Conservation  of Energy This could be extended to biological  organisms, technological systems and  engineering situations Energy Approach to Problems
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    system  is a small portion of the  Universe We identify a number of particles or objects  and draw a sphere around them There are no forces acting on anything inside  the sphere from outside the sphere We will ignore the details outside of the  sphere. A critical skill is to identify the system Systems
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    A valid system may be a single object or particle be a collection of objects or particles be a region of space vary in size and shape Valid Systems
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    Does the problem require the system  approach? What is the particular system and what is  its nature? Can the problem be solved by the  particle approach? The particle approach is what we have  been using to this time Problem Solving
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    There is a  system boundary  around the  system The boundary is an imaginary surface It does not necessarily correspond to a  physical boundary The boundary divides the system from  the  environment The environment is “the rest of the  Universe” Environment
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    Physicists define work as a measure of  how  productive an applied force has been When a force is used to make something move,  we say that this force does work.   However, only  movement parallel to the direction of the applied  force is counted. Work W = ρ Φγ∆ ρ ρ=Φ∆ρχοσθ
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    The dot product of  two vectors is  written  as  B The result is a scalar A B  cos  θ is the angle  between   A  and  B Dot Product
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    Using component form with  A  and  B :   Dot Product ö i g ö i = ϕγ ϕ= κγ κ=1 ιγ κ= κ=0 r A g r B = Α ξ Β + Α ψ + ζ
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    W  =  F   r  cos  θ The displacement is that of the point of  application of the force A force does no work on the object if the 
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This note was uploaded on 08/22/2010 for the course PHY 2048 taught by Professor Bose during the Summer '08 term at University of Central Florida.

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Lectures 15 & 16 - Energy and Kinetic Energy -...

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