classical mechanical energy
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CLASSICAL MECHANICAL ENERGYKevin Choe
WHAT IS THE MECHANICAL ENERGY?
Gravitational Potential Energy
Kinetic Energy
Total Mechanical Energy Demo Derive equation Problem Solving
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
KINETIC ENERGY
Energy of motion
Equation KE = 1/2mv2
Unit of Kinetic Energy (kg)(m/s)2 = (kg)(m2/s2) = J
EXAMPLE (FALLING BALL)
GRAPH OF THE EXPERIMENT
TOTAL MECHANICAL ENERGY
What do you see in terms of deriving an equation?
KEi+PEi = KEf+PEf
(1/2mvi2) + (mghi) = (1/2mvf
2) + (mghf)
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
CALCULATION
KEtop+PEtop = KEbottom+PEbottom
(1/2mvtop2) + (mghtop) = (1/2mvbottom
2) + (mghbottom)
(mghtop) = (1/2mvbottom2)
(ghtop) = (1/2vbottom2)
2ghtop = vbottom2
vbottom = Sqrt(2ghtop)
SOURCE
http://www.physicsclassroom.com http://www.citejournal.org/vol4/iss3/science/
article1.cfm
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