Transcript object - Kawameeh Middle School

Chapter 3 Review
8th Grade Science
Work
Energy is the ability to do ________
Energy
Definition
Kinetic
The energy an object
has because it is in
motion.
Potential
Chemical
Radiant
Stored energy that depends
on the interaction of
objects, particles, or atoms.
Example
Running,
Moving Car
Kite in a
tree
Energy that is stored in
and released from the
bonds between atoms
Fossil fuels, coal,
oil, gasoline,
match, food you
eat
The energy carried by
electromagnetic
waves.
Visible light,
electromagnetic
spectrum
Energy
Thermal
Mechanical
Sound
Definition
The sum of KE and PE of the
particles that make up an
object.
The sum of potential
energy and kinetic energy
in a system of objects.
The form of energy associated
with the
vibration or disturbance
of matter.
Example
Heat
Windmill,
Roller Coaster,
Car
Echolocation
Energy
Nuclear
Electrical
Seismic
Definition
Energy stored in and
released from the
nucleus of an atom.
The energy that an electric
current carries is a form of
KE.
The energy transferred by
waves moving through the
ground.
Example
Fission,
Fusion,
Power Plant
Outlet
Earthquake
How can you increase an object’s
Kinetic Energy?
1. Increase Mass 2. Increase Velocity
A lit match produces which two
types of energy?
Radiant Energy & Thermal Energy
State the Law of Conservation of
Energy.
Energy cannot be created or destroyed by
ordinary means. Energy can be
transformed from one form to another.
Compare and contrast energy
transfer and energy transformation.
Energy transfer is when energy travels from
one object to another. Energy transformation
is when energy is converted to another form.
Joe lifts a bag of cement 2 meters above
the floor, using a force of 125 N. How
much work is being done on the bag of
cement? W = F x d
W = 125N x 2m
W=250 J
Give an example of:
• Inclined Plane Ramp, Slide
• Lever Seesaw
• Wheel & Axle Manual
Pencil
Sharpener
Give four energy transformations
that happen when lighting a match.
Sliding Match across box → Mechanical Energy
Tip of Match (Sulfur) → Chemical Energy
Spark → Radiant Energy
Fire → Thermal Energy
Draw a picture of a ball falling in the air. Label
the points of G.P.E. and K.E. Explain the
transformation between kinetic and potential
energy C
B
A
D
E
The ball has Kinetic Energy at
points A & B. At Point C the
energy is transformed into
potential energy. Points D & E
both have kinetic energy. Point
C has the greatest Potential
Energy & Point E has the most
Kinetic Energy (right before the
ball goes into his hand)
Organize all the forms of energy into the
chart below.
Potential
Nuclear
Kinetic
Electric
Chemical
Gravitational
Elastic
Both KE + PE Waves
Mechanical
Thermal
Seismic
Radiant
Sound