Download work and energy

Is it work?
FORCE MAKES
SOMETHİNG
MOVE
WORK
Which statements are the examples of
work ?
 A teacher applies a force to a wall and becomes exhausted.
 A book falls off a table and free falls to the ground.
 A waiter carries a tray full of meals above his head by one
arm straight across the room at constant speed.
 A rocket accelerates through space.
ANSWERS
 NOT WORK
 WORK
 NOT WORK
 WORK
ENERGY
 MEASURED İN JOULES
 MOVING OBJECTS HAVE ENERGY
 SOLİD
HEATED
SO A METARİAL, HAS MORE
ENERGY WHEN HOT THAN
WHEM COLD
TEMPERATURE
RİSES
ATOMS MOVE FASTER
FORMS OF ENERGY
 Kinetic energy: This is an energy due to
motion
 Scaler quantity
FORMS OF ENERGY
 POTENTIAL ENERGY
position
shape
state
FORMS OF ENERGY
 GRAVITATIONAL POTENTIAL ENERGY
Gravitational potential energy is the energy stored in an object
as the result of its height.
Use this principle to determine the blanks in the following diagram. Knowing that
the potential energy at the top of the tall platform is 50 J, what is the potential
energy at the other positions shown on the stair steps and the incline?
http://www.physicsclassroom.com/class/energy/u5l1b.cfm
Elastic Potential Energy
A stretched
rubber band can
do work when
released, so can
a compressed
spring. Both
have elastic
potential
energy.
Chemical Potential Energy
 When a fuel burns, its
energy is released by
chemical reactions. The
energy stored in the fuel
is called chemical
potential energy.
Electrical Potential Energy
In circuits, the current is a
flow of tiny charged
particles called electrons.
These come from atoms.
Electrons can transfer
energy from a battery or a
light bulb. They have
electrical potential energy.
Nuclear Potential Energy
An atom has a nucleus.
This is made up of
particles. In some atoms,
the particles become
rearranged, or the nucleus
splits, and energy is
released. This is called
nuclear potential energy.
Thermal Energy
 When hot objects cool
down, their atoms and
molecules slow down and
lose energy. This is known
as thermal energy.
Engines use thermal
energy to do work.
Radiated Energy
The Sun radiates
light. Loudspeakers
radiate sound. Light
and sound both
travel in the form of
waves. These carry
energy.