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Chapter 13
Section 13.1 The Nature of
Energy
 Energy - The ability to do work or cause
change, such as moving an object some
distance
 Two kinds of energy
Kinetic energy (KE) - energy of motion
Potential energy (PE) - stored energy
(gravitational or spring)
 KE = 1/2 mass x velocity2
 PE = mass x acceleration due to gravity (9.8
m/sec2) x height
Chapter 13
Other types of energy
 Thermal  energy - heat
 Chemical energy - chemical
reaction/bonds
 Electromagnetic energy - light, radiation
 Electrical energy - electricity
 Nuclear energy - fission, fusion

Chapter 13
Section 13.2 Energy
conversion and conservation
   energy conversion - the process of changing
one form of energy into another
body - convert chemical energy in food to
mechanical energy to move muscles
match - mechanical  thermal  chemical 
thermal  light
Book examples - juggling, waterfall, pole vault,
pendulum
   Conservation of energy - energy cannot be
created or destroyed

Chapter 13
friction -
 reducesefficiency, converts mechanical
to thermal energy

Chapter 13
Section 13.3 Energy
conversions and fossil fuels
   Fossil fuels - contain energy that came from
the sun.
Formed from the remains of ancient plants and
animals.
coal, petroleum, natural gas - chemical potential
energy
 Energy conversions pg. 424 - Flowchart
 Fossil fuels can be burned to release the
potential chemical energy

Chapter 13
Section 13.4 - Power
 Power  - The rate at which work is done
 power = work/time     power = force x
distance/time
 power units = J/sec = Watts (W)
 sample problems pg.427
 Power is the rate at which energy is
transferred from one object to another
or converted from one form to another.

Chapter 13
Chapter 13 Vocabulary
 energy
 kinetic energy
 potential energy
 energy conversion
 law of conservation of energy
 fossil fuels
 power

Chapter 13

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