Physics of Fun 26min Energy Any change in motion requires Energy Work is done when a change occurs Work cant be done without energy When an object or organism does work on another object some of its energy is ID: 605896
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Slide1
Energy of Motion
Physics of Fun (26min)Slide2
Energy
Any change in motion requires –
Energy
.
Work
is done when a
change
occurs.
Work
can’t be done without
energy
!
When an object or organism does work on another object, some of its energy is
transferred
to that object.
Law of Conservation of Energy
– Energy cannot be created nor destroyed but is transferred from one object to another.Slide3
Types of Energy
2 Types of Energy:
Potential Energy
(PE) –
stored
energy
Associated with
position
– increase an object’s
height
, increase the amount of
PE
it has.
A roller coaster at the top of the peak
An arrow in a bow that is drawn back
The food you are about to eat
Kinetic Energy
(KE) – energy of
motion
Depends on the objects
mass
and
velocity
Double
an object’s
mass
=
double
it’s
KE
Double
an object’s
velocity
=
quadruple
it’s
KE
An
arrow flying
A bus moving
A rock rolling down a hillSlide4
Identifying Potential & Kinetic Energy
What type of energy did the ball have as the girl held it at the top of the cliff?
What type of energy did the ball have after she let the ball go?
When would kinetic energy be the greatest?
Potential Energy
Kinetic Energy
Just prior to hitting the groundSlide5
Identifying Potential & Kinetic Energy
At what location(s) would the biker have
kinetic energy
?
What type of acceleration would the biker have at
A
?
At what location(s) would the biker have potential energy?
Where would the biker’s kinetic energy be the greatest? Why?
A & C
B
C – greater velocity
A
B
C
Negative Acceleration – slowing downSlide6
Potential & Kinetic Energy
Would Student A or Student B have the
least
Potential Energy
?
Would
Student A or Student B have the greater velocity
?Would Student A or Student B have the greater Kinetic Energy?
Student
A
–
lower height
Student B – longer fall
Student B – greater velocity = greater KESlide7
Potential vs. Kinetic
Kinetic
Energy can
NEVER
be greater than
Potential
Energy.
Energy is lost due to friction and/or gravity.
Bounce a ball, the second bounce will be shorter than the starting height of the first bounce.Gravity pulls the ball downAir resistance
(friction) slows the ball down as it falls.A roller coaster will never have a second height higher than the initial drop off.Friction
turns energy into heat and slows it down.Slide8
Potential vs. Kinetic Energy
At what location does the ball have the greatest potential energy?
At what location does the ball have the greatest kinetic energy?
What factors affect the bounce at D and make it so it will not reach the same height as A again?
A
C
Gravity and air resistance