classical mechanical energy
DESCRIPTION
Classical Mechanical Energy. Kevin Choe. What is the Mechanical energy?. Gravitational Potential Energy Kinetic Energy Total Mechanical Energy Demo Derive equation Problem Solving. Potential energy. T he stored energy of position possessed by an object Equation PE = mgh - PowerPoint PPT PresentationTRANSCRIPT
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CLASSICAL MECHANICAL ENERGYKevin Choe
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WHAT IS THE MECHANICAL ENERGY?
Gravitational Potential Energy
Kinetic Energy
Total Mechanical Energy Demo Derive equation Problem Solving
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POTENTIAL ENERGY
The stored energy of position possessed by an object
Equation PE = mgh
Unit of Potential Energy (kg)(m/s2)(m) = (kg)(m2/s2) = J
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KINETIC ENERGY
Energy of motion
Equation KE = 1/2mv2
Unit of Kinetic Energy (kg)(m/s)2 = (kg)(m2/s2) = J
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EXAMPLE (FALLING BALL)
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GRAPH OF THE EXPERIMENT
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TOTAL MECHANICAL ENERGY
What do you see in terms of deriving an equation?
KEi+PEi = KEf+PEf
(1/2mvi2) + (mghi) = (1/2mvf
2) + (mghf)
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PROBLEM
What is the speed of the object right before hitting the ground? Derive Vbottom equation from the Total Mechanical
energy. (KEi+PEi = KEf+PEf) Play simple algebra
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CALCULATION
KEtop+PEtop = KEbottom+PEbottom
(1/2mvtop2) + (mghtop) = (1/2mvbottom
2) + (mghbottom)
(mghtop) = (1/2mvbottom2)
(ghtop) = (1/2vbottom2)
2ghtop = vbottom2
vbottom = Sqrt(2ghtop)
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SOURCE
http://www.physicsclassroom.com http://www.citejournal.org/vol4/iss3/science/
article1.cfm