j. gabrielse conservation of energy (e). j. gabrielse conservation of energy (e) energy (e) means...
TRANSCRIPT
J. Gabrielse
Conservation of Energy (E)
J. Gabrielse
Conservation of Energy (E)
Energy (E) means
Total Energy
J. Gabrielse
Drop a Ball off a Cliff
J. Gabrielse
Drop a Ball off a Cliff
When is the ball moving the fastest?
at the lowest point *
* just before it hits the grounds and just after
J. Gabrielse
Drop a Ball off a Cliff
When is the ball moving the fastest?
at the lowest point *
When is the ball moving the slowest?
at the highest point
(it has to stop in order to change directions)
J. Gabrielse
Drop a Ball off a Cliff
When is the ball moving the fastest?
When is the ball moving the slowest?
What is the ball trading for speed?
at the highest point
at the lowest point *
height
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Us
Conservation of EnergyUg K E
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Ug K EConservation of Energy
Gravitational Potential Energy Depends on Height
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Ug K E
Kinetic Energy Depends on Speed
Conservation of Energy
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Ug K E
Mechanical Potential Energy Depends on Deformation
Conservation of Energy
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Us
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Ug K EE = Us + Ug + K
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Us
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Ug K ETotal Energy Doesn’t Change
+ =
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Us +
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Energy Notes (Continued):
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Conservation of Energy with a Pendulum
When is the pendulum moving the fastest?
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Conservation of Energy with a Pendulum
When is the pendulum moving the fastest?
at the lowest point
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Conservation of Energy with a Pendulum
When does the pendulum have the most kinetic energy?
at the lowest point
J. Gabrielse
Conservation of Energy with a Pendulum
When does the pendulum have the most
gravitational potential energy?
at the highest point
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E
Conservation of Energy with a Pendulum
KUg
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E
Conservation of Energy with a Pendulum
KUg
Gravitational Potential Energy Depends on Height
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EUg
Kinetic Energy Depends on Speed
Conservation of Energy with a Pendulum
K
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EKUg
E = Ug + K
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EKUg
Total Energy Doesn’t Change
+ =
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A E
DC
B
Pendulum Review
Where is the gravitational potential energy maximum?
Where is the kinetic energy maximum?
Where is the gravitational potential energy minimum?
Where is the kinetic energy minimum?
J. Gabrielse
Your Turn
Conservation of Energy