PC_Chapter_08 c

# PC_Chapter_08 c - TodayonPHY2048 Examples on Work Spring...

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Today on PHY2048 Examples on Work Spring and Hooke’s law Inclined plane Kinetic Energy (KE) Work-KE Theorem Examples on Work-KE Theorem Potential Energy Law of Conservation of Energy

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Example
Example W gravity = m g sin θ. d W gravity = mgsin θ dcos θ W gravity = mgsin θ dcos 180 W gravity = -mgsin θ d Here d = x

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Example
Example

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Example
Example

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Kinetic Energy Kinetic Energy is the energy of a  particle due to its motion K  = ½  mv 2 K  is the kinetic energy m  is the mass of the particle v  is the speed of the particle A change in kinetic energy is one  possible result of doing work to transfer  energy into a system
Kinetic Energy, cont Calculating the  work: 2 2 1 1 2 2 f f i i f i x x x x v v f i W F dx ma dx W mv dv W mv mv = = = = -

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Work-Kinetic Energy Theorem The Work-Kinetic Energy Principle states  Σ W  =  K f   –  K i   K In the case in which work is done on a system  and the only change in the system is in its  speed, the work done by the net force equals  the change in kinetic energy of the system. We can also define the kinetic energy K  = ½  mv 2
Work-Kinetic Energy Theorem  – Example

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Work-Kinetic Energy Theorem  – Example
Work-Kinetic Energy Theorem  – Example

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Work-Kinetic Energy Theorem  – Example
Work-Kinetic Energy Theorem  – Example

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Work-Kinetic Energy Theorem  – Example
Work-Kinetic Energy Theorem  – Example

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Work-Kinetic Energy Theorem  – Example
Internal Energy The energy associated  with an object’s  temperature is called its  internal energy E int In this example, the  surface is the system The friction does work  and increases the  internal energy of the  surface

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Examples of Ways to Transfer  Energy a) Work b) Mechanical  Waves c) Heat
Examples of Ways to Transfer  Energy, cont. d) Matter transfer e) Electrical  Transmission f) Electromagnetic  radiation

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Conservation of Energy Energy is conserved This means that energy cannot be created  or destroyed If the total amount of energy in a system  changes, it can only be due to the fact that  energy has crossed the boundary of the  system by some method of energy transfer
Conservation of Energy

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Chapter 8 Potential Energy
Potential Energy Potential energy  is stored  energy . The energy is stored by doing  work against a force such as gravity or the spring in a clockwork  motor.

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Potential Energy Potential energy  is stored  energy . The energy is stored by doing  work against a force such as gravity or the spring in a clockwork  motor.
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## This note was uploaded on 10/21/2010 for the course PHY 2048 taught by Professor Bose during the Spring '08 term at University of Central Florida.

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PC_Chapter_08 c - TodayonPHY2048 Examples on Work Spring...

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