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The Simple Pendulum
A Classic Case Study
New Core Curriculum:
Foundations of Scientific Process
Mechanical energy
Chemical energy
Radiant energy
Electrical energy
Nuclear energy
Various Forms of Energies
Let’s review from last time….
Forms of Energy Nuclear
Electrical
RadiantChemical
Mechanical
Hea
t Eng
ine
Fric
tion
Elec
toly
sis,
ch
argi
ng st
orag
e ba
tter
y
Batt
ery,
Fue
l Cel
l
Oxidation
Photosynthesis
Electric Motor
Electric GeneratorG
amm
a
Fusi
on
Solarcell
Light-bulb
Friction,burning
Heat engines
ENERGY =WORK +
HEAT
• In colloquial language, ENERGY is equated with vigor, liveliness and vitality
• In science, ENERGY is defined as the ability to do work and transfer heat
Don’t Confuse Power, Work & Energy…
WORK not concerned with a nature of the task, tiredness, etc.
defined as force acting through certain distance
units: Joules, calories (cal), nutritional Calorie (kcal)
Don’t Confuse Power, Work & Energy…
HEAT energy of atomic / molecular motion
this energy always flows from warmer to cooler object
units: Joules, calories (cal), nutritional Calorie (kcal)
Don’t Confuse Power, Work & Energy…
POWERP = W / t
work being done in a certain time frame
units: [J/s = Watts, horse power: 1 hp = 746 W]
Don’t Confuse Power, Work & Energy…
Energy Can Be Classified As Kinetic (KE) or Potential (PE) Energy
PE can be converted to KE and KE can be converted to PE
Etotal = KE + PE
The Period vs. Angle