Transcript Potential and Kinetic Energy

Chp. 2 Forms of Energy
What is energy?
It is the ability to
cause change.
A plant uses
energy from the
sun
Energy causes
change in position
Potential
and Kinetic
Energy
What is Kinetic Energy?
o Energy an object has due
to its motion
Kinetic
Motion
depends on speed
depends on mass
the more the mass,
the more kinetic
energy
Potential
stored energy due
to interaction of
objects and
particles.
How is all energy divided?
All Energy
Potential
Energy
Gravitation
Potential
Energy
Kinetic
Energy
Motion
Elastic
Potential
Energy
Holding a book
Gravitational Potential
Stored between earth and book
Chemical
Potential
Energy
Elastic P
Increases
as stretched
stored in chemical bonds
released with a reaction
What is Gravitational Potential
Energy?
Don’t look down,
Rover!
Good boy!
o Potential energy
due to an object’s
position
What causes greater
change, dropping a
bowling ball or
tennis ball at 1m?
the bowling ball
What is Elastic Potential Energy?
o Potential energy due compression or
expansion of an elastic object.
Notice the ball compressing
and expanding
What is Chemical Potential Energy?
o Potential energy
stored within the
chemical bonds of
an object
o Work is the transfer of
energy when a force ?
makes an object move in
the direction of the force.
You are
transferring energy
right now by
writing. You are
applying force
while the force is
applied from the
pencil to the paper.
Forms of energy
Mechanical Energy
Sound Energy
Thermal Energy
Electric
Energy
Radiant Energy—
Light energy
Nuclear Energy
chp. 2 Lesson 2
Transformations
Popcorn kernel
energy transformation
Microwave transfer
electric to radiant to
thermal energy,
kernals become hot
Law of conservation of energy
http://www.neok12.
com/video/Law-ofConservation/zX0a
7f7a41717c595f78
7f0a.htm
https://www.youtub
e.com/watch?v=C
mttxT1Wl1M
pg. 50
Kinetic to potential
Ball leaves the
hands at its
highest, energy
changes from K to
P
Potential to Kinetic
When the ball
reaches the other
players hand, goes
from P to K
from the chart on
page 50, Where is the
highest gravitational
potential energy?
balls highest point
Law of conservation of energy
Everyday
examples how is
energy transferred:
when you push a
book
Run into your
brother
dog runs into the
Christmas tree
Friction
causes
transformation
causes thermal
energy
brakes on a bike
rubbing hands
together
drifting??
Using Energy
Thermal: In a jet,
burning fuel
releases thermal
Chemical: eating
food (digesting)
photosynthesis after
sun absorbs radiant it
turns it into chemical
for food
Radiant: cell phone
receive it.
Electric: MP3
players, hair dryers
Waste energy:
Thermal energy
that moves into the
air.