energy and momentum - physik.uni-siegen.de · linear momentum - impuls. conservation of linear...
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Energy and momentum
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Work – kineticEnergy theorem
W= F d cos Q
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Work byhorizontal movement
Work bygravitational force
W = Kf – Ki =½ mv² - ½ mv0²= F*d
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Elevator capdescent
W = - m g d cos f
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Work by spring force
F = - k d Hook´s law
W = ½ kxi² - ½ k xf²W < 0
W > 0
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Work by a variable force
DWj = Fj Dx
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Potential energy
DU = - W
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Conservative force
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Gravitationalpotential energy
U(y) = m g (y – yi) = m g (y – 0) = m g h
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Conservativemechanical energy
K1 + U1 = K2 + U2
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Potential energycurves
K(J)
0
-5
1
Energy necessary toescape
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Potential energy landscape Periodic potential for electrons in a solid
bonding state
free state
Energynecessary toliberate
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Linear momentum -Impuls
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Conservation oflinear momentum
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Inelastic collision
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Elastic collision
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Collision in 2D
X-axis
Y-axis
Conservation of momentum
Conservation of energy