Energy: What it IS, what it is NOT, and How we know
© Walter Scheider 2003
#00 Title
Models that represent "Energy"
#01 PE-gravitation, falling object to table
#02a rolling push - no friction
#02b sliding push - with friction
#03 PE-gravitation, falling object to table
#04 Energy scheme
What is behind the energy scheme?
#05a "skeleton" of the derivation of Work-Energy Theorem
#05b Work-Energy Theorem
The Frames of reference problem
#06a PE-gravitation, falling object to table
#06b PE-gravitation falling object to floor
#06c PE-grav falling object to table//to floor
Nature's deafening silence about velocity
#11 Meredith 01 - on the ground
#11a Meredith 01-steps - timed work
#12 Meredith 02 - on the stationary bus
#13 Meredith 03 - moving bus, observer on the bus
#14 Meredith 04 - moving bus, observer on the ground
Energy is not substance-like - The failure of flow to track
#15 splitting rocket 01 - observer in initial rocket frame
#16 splitting rocket 02 - observer on earth
Do measurements in any particular frame of reference have meaning?
#17 Meaning of measurements: two points in a plane -- axes
                          Conservation of Energy
                          #21 Work-Energy Theorem to Conservation Law, algebra
                          #22 WE-theorem
                          #23 reprise -- axes
Applications
#31 rollercoaster
Who does the work?
#32 propulsion -- model
#33 propulsion -- car -- tire
Are there different kinds of energy?
Where does energy come from? Bonds
#41 Energy scheme
#42 Forces of attraction: Bonds00
#43 hydroelectric power
#44 Chemical bonds - fuel (carbon + oxygen)
Is nuclear energy exempt from the Work-Energy principle?
#45 What DOESN'T happen in uranium fission
#46 nuclear bond energy graph
#47 What DOES happen in uranium fission
Where does chemical (and all other) bond energy come from?
#48 forces and energy in ionic bonds
#49 forces and energy in charged cookie sheets
Activation
#51 activation in 4-cycle internal combustion engine
#52 schematic of ener-barrier
#53 random energy to lift domino over energy barrier
Chemistry -- energy barriers, systems going toward equilibrium
#54 dice02 -- 4 aces rolled
#55 dice03 -- 4 aces loaded dice
#56 dice04 -- 4 three's loaded dice
#56 going to equilibrium - exothermic reactions
#57 going to equilibrium - endothermic reactions
miscellaneous teaching movies
#61steam cycle
#62how does the table know how hard to push up to support a winebottle