Work and Energy Pre-class study material Slide show mode
recommended
Slide 2
Energy and Work 2 Energy: the ability to do work money in bank
accounts Work: energy transferred to or from an object by means of
a force acting on the object money transferred between
accounts
Slide 3
Types of Energy 3 Mechanical Electrical Electromagnetic
Chemical Nuclear Thermal
Slide 4
Types of Energy - Mechanical 4
http://www.citruscollege.edu/lc/archive/biology/Pages/Chapter05-Rabitoy.aspx
h v Kinetic energy - Energy of a moving object Gravitational
protential energy - Energy an object contains due to its position
Derivation of energy equation will be discussed in class
Slide 5
Types of Energy - Mechanical 5 Elastic potential energy -
Energy stored in an object that is being stretched, squashed,
twisted, you name it! Kinetic energy - Energy of a moving object
Gravitational protential energy - Energy an object contains due to
its position Derivation of energy equation will be discussed in
class
Slide 6
Types of Energy - Mechanical 6 Elastic potential energy -
Energy stored in an object that is being stretched, squashed,
twisted, you name it! Kinetic energy - Energy of a moving object
Gravitational protential energy - Energy an object contains due to
its position Sound energy - Associated with the potential and
kinetic energy of air molecules What can you hear in vacuum?
Shimmering air
Slide 7
Types of Energy Electrical energy -Supplied by the combination
of electric current and electrical potential that is delivered by
the circuit -Caused by movement of electrons 7
Slide 8
Types of Energy Electromagnetic energy -Energy emitted and
absorbed by charged particles which exhibits wave-like behavior as
they travel through space -Radio bands -Microwave -Infrared
-Visible light -Ultraviolet -X-rays -Gamma rays 8 Light energy
Slide 9
Types of Energy Chemical energy -Potential of a chemical
substance to undergo a transformation through a chemical reaction
-Breaking or making of chemical bonds 9 Nuclear energy -Energy
released when the nuclei of atoms are split or fused shale rocks
containing oil sugar
Slide 10
10 Types of Energy Thermal energy -Energy of a substance or
system related to its temperature, i.e., the energy of moving or
vibrating molecules Whats the relationship between thermal energy
and heat?
Slide 11
11 Work and Energy Conversion Doing work = Transferring energy
The transfer of energy sometimes accompanies the conversion between
different types of energy I lift a heavy box: I apply force to
increase the gravitational potential energy of the box The tungsten
bulb lights up: electrical energy heats up the filament, i.e.
increase thermal energy, which converts to electromagnetic energy
(light) Name some work and energy conversion you see in daily life
Relationship between thermal energy and heat: heat is the energy
transferred from one body to another by thermal interactions
Slide 12
12 Work and Energy Are you ready for a 3-minute quiz? See you
in class!