Transcript Conservation of Energy and the Egg Drop

Bellwork
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What is the conservation of
energy?
Lab due tomorrow (Fri. 1/17/14)
Energy can not be created or
destroyed, but it can be
transformed from one form to
another, the total amount never
changes.
Conservation of Energy and
the Egg Drop Project
1/16/14
Mechanical Energy
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If there are no non-mechanical
energies involved in a system,
then mechanical energy can
transform from one energy to
another.
PEint + KEint = PEfinal + KEfinal
PE = 10000 J
KE = 0 J
PE = 10000 J
KE = 0 J
PE = 7500 J
KE = ?
PE = 7500 J
KE = 2500 J
PE = 5000 J
KE = ?
PE = 5000 J
KE = 5000 J
PE = 2500 J
KE = ?
PE = 2500 J
KE = 7500 J
PE = 0 J
KE = ?
PE = 0 J
KE = 10000 J
Mechanical and Non
Mechanical Energies
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If there are non-mechanical
energies involved in a
system, energy is still
conserved.
PEint + KEint = PEfinal + KEfinal + TE
(on formula card)
Used in the lab!
Conservation of Energy
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For objects falling or going down a
hill
Gravitational potential energy is
being transferred into kinetic
energy and thermal energy (if
friction and air resistance is
accounted for)
PEint + KEint = PEfinal + KEfinal + TE
Energy Relationships
Energy – Flow Chart
Energy
Mechanical
Kinetic
Non-mechanical
Potential
Light
Linear
Gravitational
Rotational
Elastic
Electric
Magnetic
Sound
Heat
Equation
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Work and Kinetic Energy
Egg Drop Project
Work
 Potential Energy (top)
 Kinetic Energy (bottom) no TE
 Velocity (bottom)
 Momenta (bottom)
 Force (bottom)
 Power to stop the egg
 Time (max) to stop the egg
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Egg Drop Project
 Catchers
due next
Tues. 1/21/14!
 Bring in, store bought,
raw eggs if you want
multiple tries.
 You can not modify the
egg (face okay)
Calendar Ahead
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Fri. 1/17 – Lab Due
Tues. 1/21 – Egg Catchers Due
Thur. 1/23 – H.W. Assignment Due
Mon. 1/27 – Egg Project Analysis
Due
Wed. 1/29 – Test Review Due
Thur. 1/30 – Energy Test Part 1
Fri. 1/31 – Energy Test Part 2
Today
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Finish the lab
Work on the homework assignment
Work on project analysis