Transcript does not - Greer Middle College || Building the Future

friction
Causes some mechanical energy
to change into thermal energy.
Mechanical energy
Total amount of kinetic and potential
energy in a system.
joule
respiration
SI unit of energy
energy
The ability to cause change.
Gravitational potential
energy
Energy stored by things that are
above earth.
Potential energy
Stored energy due to position.
Elastic potential
energy
Energy stored by things that
stretch or compress.
Kinetic
energy
Energy in the form of motion.
Chemical
potential energy
Energy stored in chemical bonds.
calorie
Unit used to measure energy in
food.
Law of conservation
of energy
Energy cannot be created or
destroyed.
Kilogram (kg)
Standard unit for mass.
m/s
Standard unit for speed.
m/s²
Standard unit for acceleration.
watt
Standard unit for power.
Newton (N)
Standard unit for force.
Joule (J)
Standard unit for work.
Meter (m)
Standard unit for distance.
Kelvin
Standard unit for thermal energy.
wedge
Name the simple machine:
ax
screw
Name the simple machine:
incline plane wrapped in a spiral
around a cylindrical post.
Wheel and axle
Name the simple machine:
a steering wheel
Inclined plane
Name the simple machine:
sloping surface used to raise an
object.
pulley
Name the simple machine:
grooved wheel with a rope,
simple chain, or cable running
along a groove.
Thermal energy
The sum of kinetic and potential
energy of all the atoms in an
object.
Specific heat
Amount of heat needed to raise
the temperature of 1 kg of a
material by 1⁰ C or K.
heat
Thermal energy that flows from
something at a higher
temperature to something at a
lower temperature.
temperature
Related to the average kinetic
energy of an object’s atoms or
molecules.
work
Transfer of energy that occurs
when a force makes an object
move.
g=9.8 m/s²
mass
height
What three things are used to
calculate gravitational potential
energy?
Friction
(example: moving a tire)
What can cause kinetic energy to
change into thermal energy?
True-when potential energy goes up,
kinetic energy goes down and vice versa,
but the total energy remains the same.
True/False
The mechanical energy of a
system always remains the same.
Throwing a
ball upward.
Give an example of kinetic
energy being converted into
potential energy.
KE=1/2(80)(4.6)²
Steps: 4.6 x 4.6 x 80 / 2
KE=846.4 J
Calculate the kinetic energy of
Sam, a 80 kg man
running 4.6 m/s
KE=1/2 m x v²
GPE=9.5 x 9.8 x 2.5
GPE=232.75 J
What is the gravitational
potential energy of a 9.5 kg ball
on top of a 2.5 m shelf.
GPE=mgh
g=9.8 m/s²
It decreases
If the mechanical advantage of a
lever decreases, what happens
to the output force?
A compound
machine
A hand operated can opener is
an example of what kind of
machine?
W=175 x 3.5
W= 612.5 J
How much works is done in
lifting a 175 N box onto a shelf
3.5 m high?
Work=force x distance
Simple
machine
A machine that does work with
one main motion is a ______
_______.
insulator
A material that reduces the flow
of heat by conduction,
convection and radiation is called
a/an ___________.
convection
The process of warm water rising
and cold water sinking in the
ocean is called _________.
false
True/False
A high specific heat indicates
that a substance will heat up
faster than a substance of lower
specific heat.
copper
Which is the best conductor of
heat: air, water, copper or
plastic?
R-Value
Higher R-value=better insulation
The effectiveness of insulation is
rated with a/an ________.
false
True/False
Heat pumps convert thermal
energy into mechanical energy/
matter
The transfer of thermal energy
by radiation does not require
_________.
false
True/False
Refrigerators and air conditioners
are heat engines.
As the lava heats up,
it expands and
becomes less dense
Why does the lava in a lava lamp
rise?
hotter object to
a cooler object
The transfer of heat is from a
_____ object to a ________
object.
The molecules are moving faster
causing the water molecules to
collide more often with the dye.
Why would food dye disperse
more quickly in warm water than
in cool water?