Transcript Energy Transfer and Transformations (6th Grade)


SC.6.P.11.1 Explore the law of
conservation of energy by differentiating
between potential and kinetic energy.
Identify situations where kinetic energy is
transformed into potential energy and
vice versa.
The ability to do work.
Potential to due work:
potential energy
or
Putting energy into motion:
kinetic energy

Energy due to an object’s position or stored
energy (the ability to move).
Measure by:
PE= (weight) (gravity) (height)
(the earth’s gravitational pull
9.8 m/sec sq)
When energy that is stored is put to
use, an object begins to move. The
energy is now transferring from
potential energy into kinetic energy.
Standing still
Running
The energy of motion/movement
Measured by:
2
KE= ½ (Mass) (Velocity)
Use a balance to measure mass.
POTENTIAL
KINETIC

Stretching a rubber band

Water at the top of a waterfall

Yo–Yo held in your hand

Drawing a bow and arrow

Shooting a rubber band

Water falling over the fall

A Yo-Yo in motion

Releasing the arrow from the bow


Energy conservation
and conversion are
important
considerations for all
systems.

When work is done,
energy changes from
one form to another.
› ex. As a roller coaster
ascends to its highest
point, PE is at its highest.
(needs to store energy in
order to get down). As
the coaster descends
down, the PE is
transferred into KE
(greater speed).
Mechanical systems
have both potential
energy and kinetic
energy.

Energy is neither
created nor destroyed
during any process,
only changed in form.
› Energy cannot be created or
destroyed.
› If the total amount of energy in a
system changes, it can only be due
to the fact that energy has changed
forms.
9
If a tennis ball and basketball are
dropped from one meter high, explain
why both balls would not rebound the
one meter?
1.
If a tennis ball and basketball are dropped from one
meter high, explain why both balls would not
rebound the one meter?
Both balls would not rebound back to the starting
point because of energy transformations. Holding
the ball at 1 meter = PE while dropping the ball
converts the PE into KE. Once the ball hits the floor,
energy is transferred in the form of heat (friction
between ball and ground). Friction such as air
resistance is also causes a loss off energy from the
ball. Therefore, the ball after hitting the ground does
not have the same amount of energy as when
released and cannot return to the same height. Try
it!