Transcript energy. - Paul Knox Middle School

Energy Review Questions
2014/2015
Question 1
• Energy B (Energy generated from the sun)
describes solar energy. Which of the following is
the best example of solar energy being used?
–
–
–
–
driving a nail into a board with a hammer
causing vinegar to fizz by adding baking soda
using a vacuum cleaner that is pulled into the wall
starting a fire with a magnifying glass instead of
matches.
Question 2
• Billy is clapping his hands. He is using which
type of energy described in the above list?
– Energy B
– Energy C
– Energy D
– Energy E
Question 3
• The type of energy described by Energy C is
which type of energy?
– heat energy
– chemical energy
– electrical energy
– mechanical energy
Question 4
• Most of the energy used on earth originally
came from the
– air
– sun
– soil
– oceans
Question 5-8
• Energy created by the motion and position of an
object.
• Energy generated by the sun
• Energy released when particles react to form new
substances
• Energy that flows through a circuit
–
–
–
–
solar energy
chemical energy
electrical energy
mechanical energy
Question 9
• If a truck is moving down the interstate faster
than a car, the truck has
– more gas
– more kinetic energy
– more chemical energy
– more potential energy
Question 10
• Which of the following has the most
potential energy?
– ball on top of a table
– ball on a mountain top
– ball resting on flat ground
– ball being thrown in the air
Question 11
• Water behind a dam represents which type
of energy?
– solar energy
– kinetic energy
– potential energy
– electrical energy
Question 12
• What type of energy does the ball have at
position A?
– solar energy
– kinetic energy
– potential energy
– mechanical energy
Question 13
• Which statement best describes what is
happening to the energy of the ball from
position A to position B?
– The energy is being transformed from heat to
mechanical.
– The energy is being transformed from potential to
kinetic.
– The energy is being transformed from kinetic to
mechanical.
– The energy is being transformed from mechanical to
chemical.
Question 14
• Which statement best describes what
happens when you run?
– Chemical energy is transformed to heat energy.
– Chemical energy is transformed to solar energy.
– Chemical energy is transformed to kinetic energy.
– Chemical energy is transformed to electrical
energy.
Question 15
• Scenario D shows a stove powered by an
outlet plug. In scenario D a person is hoping
to create heat energy from
– solar energy
– chemical energy
– electrical energy
– mechanical energy
Question 16
• Potential energy is transformed into kinetic
energy in which of the above scenarios?
– Scenario B
– Scenario C
– Scenario A
– Scenario E
Question 17
• Scenario B shows a plant using photosynthesis
to create its own food. Which of the following
energy transformations is represented by
Scenario B?
–
–
–
–
solar  electrical
solar  chemical
solar  mechanical
solar  kinetic
Question 18
• In all of the energy transformations shown
above, the total amount of energy
– remained the same as it transformed into another
form of energy
– increased when it transformed into another form of
energy
– disappeared when it transformed into another form of
energy
– decreased when it transformed into another form of
energy
Question 19
• Which energy form would best complete the
“transformed to” (Y) section of the table for
the flashlight?
– light
– sound
– chemical
– mechanical
ITEMS
flashlight
automobile engine
loudspeaker
automobile brake
microphone
Original Energy
Chemical
Chemical
X
Mechanical
Sound
Transformed To
Y
Mechanical
Sound
Heat
electrical
Question 20
• If the loudspeaker is plugged into a wall
socket, which form of energy would best
complete the “original energy” (X) section of
the table for the loudspeaker?
• solar
• chemical
• electrical
• mechanical
ITEMS
flashlight
automobile engine
loudspeaker
automobile brake
microphone
Original Energy
Chemical
Chemical
X
Mechanical
Sound
Transformed To
Y
Mechanical
Sound
Heat
electrical
Question 21
• The light bulbs in our classroom turn on by the
flick of switch. Which of the following explains
why this happens?
– The light bulbs are heated until it starts to give off
light.
– The light bulbs are rotated until it starts to give off
light.
– The light bulbs are the site of a chemical reaction that
produces light.
– The light bulbs are connected to a circuit through
which electrical energy flows.
Question 22
• When it becomes part of an electrical circuit,
which of the following items demonstrates
how electrical energy can be transformed
into mechanical kinetic energy?
– fireplace
– television
– ceiling fan
– telephone
Question 23
• When it becomes part of an electrical circuit,
which of the following items has the ability
to transform electrical energy into sound
energy?
– light bulb
– television
– iron
– refrigerator
Question 24
• The picture to the right shows a coil of wire
wrapped around an iron core. When this
device is quickly rotated around a magnet
electricity is produced. The device that
produces electricity is known as a(n)
– insulator
– conductor
– generator
– transmitter
Question 25
• The picture above shows a coil of wire
wrapped around an iron core. When
electricity is supplied to the coil of wire,
which of the following devices is created?
– bar magnet
– electromagnet
– molecular magnet
– permanent magnet
Question 26
• The temperature inside Mrs. McMullan’s house
is 20ºC, but it is snowing outside and the
temperature is below 0ºC. Mrs. McMullan is
able to stay warm in her house, because she has
transformed electrical energy to ____ energy.
–
–
–
–
kinetic
thermal
chemical
mechanical
Question 27
• Which of the following object’s main function
is to convert electrical energy to mechanical
energy?
A.
B.
C.
D.
Question 28
• You can create a complete circuit with the
following items:
– light bulb and wires
– light bulb and switch
– light bulb, battery, wires
– battery, light bulb, and electric motor
Question 29
• Heat energy transfers
– only during the daytime
– only when objects are touching
– from an area of higher temperature to an area of
lower temperature
– from an area of lower temperature to an area of
higher temperature
Question 30
• Which statement below describes the energy
transformation shown in the above scenario?
– electrical  soundlight
– sound  light  electrical
– electrical  light  sound
– light  electrical  sound
Question 31
• When lifting a heavy object, the crane relies
mostly on which of the following simple
machines to make the job easier?
– lever
– pulley
– wedge
– inclined plane
Question 32
• The volleyball players at Myrtle Beach should
wear sunscreen, hats, and sunglasses to
protect themselves from
– injury from the ball
– too much radiation
– too much sweating
– injury from teammates
Question 33
• The simple machine below allows the movers
to _____ in order to help new neighbors
move in.
– apply greater force over smaller distance
– apply greater force over greater distance
– apply smaller force over smaller distance
– apply smaller force over greater distance
Question 34
• The temperature in the classroom was 34°C before the
custodians turned on the heat. Ten minutes later the
temperature in the classroom was 42°C. Which statement
below explains this change in heat energy?
– The temperature increased because the Sun came out.
– The temperature increased because it was later in the day.
– The temperature increased because the air particles began to
move faster.
– The temperature increased because there was more sound
energy in the building.
•
Question 35
• The squiggly lines coming from the fire (Scenario C)
are used to represent radiation. Which of the
following is the best way to describe the term
“radiation” as it relates to the transfer of heat
energy?
– the transfer of heat without the help of heated particles
– the transfer of heat through direct contact of heated
particles
– the transfer of heat through the movement of heated
particles, without direct contact
– the transfer of heat from an area of lower temperature to
an area of higher temperature
Question 36
• In Scenario B the man’s hand gets hot,
because he is holding the handle of the pot.
This scenario illustrates which form of heat
transfer
– Radiation
– Convection
– Conduction
– thermalization
Question 37
• If the man in the above picture touched the side
of the hot pot with his cold hand, the heat
energy would flow in which direction?
– The heat energy would not transfer.
– The heat energy would transfer from the man’s cold
hand to the hot pot.
– The heat energy would transfer from the hot pot to
the man’s cold hand.
– The heat energy would transfer to which ever object
had the largest mass.
Question 38
• Scenario A shows the water particles
circulating in the pot as it is held over the
fire. This is an example of which type of heat
transfer?
– radiation
– insulation
– conduction
– convection
Question 39
• If a metal spoon and a wooden spoon are both
placed in a pot of boiling water for the same
amount of time, infer what would happen when
the spoons were taken out of the water.
–
–
–
–
Both spoons would begin to melt.
Butter would melt faster on the metal spoon.
Butter would melt faster on the wooded spoon.
Both spoons would melt the butter at the same
speed.
X
Question 40
• Which statement best summarizes what is
happening in photos X and Y?
– The person in photo X is applying less force
because he is using wheels.
– The people in photo Y are applying less force
because they are working together.
– The person in photo X is applying less force
because his boxes are stacked up straight.
– The people in photo Y are applying less force
because their boxes are not stacked up straight.
Y
Question 41
• Captain Tom wants to pull in his shrimp nets
from the ocean to weigh his harvest. How will
using a multiple-pulley system reduce the force
Captain Tom must use?
– A multiple-pulley system requires the force to move
over a larger distance than the load.
– A multiple-pulley system requires the load and the
force to move over the same distance.
– A multiple-pulley system requires the force to move
over a smaller distance than the load.
– A multiple-pulley system requires the load to move
over a greater distance than the force.
Question 42
• Scenarios B and C
demonstrate a change in
the position of an object.
Which of the following
statements is also true of
scenarios B and C?
– energy has been stored
– energy has been created
– energy has been
transferred
– energy has been lost
Question 43
• In Scenario A, no
mechanical work was
done. What scientific
reason supports this
idea?
– The box has no mass.
– The box did not move.
– The man did not exert a
force.
– The box and the man have
the same mass.
• Which of the above
scenarios requires
the most
mechanical work?
– Scenario A
– Scenario B
– Scenario C
– All scenarios require
equal work.
Question 44
• What is the purpose of all
of the simple machines
found in the tools to the
right?
– to reduce the distance that
an object needs to be moved
– to reduce the force need to
move an object over a
distance
– to reduce the mass of an
object that needs to be
moved over a distance
– to reduce the amount of
work needed to move an
object over a distance
Question 45
Question 46
• Which of the above tools is made of an
inclined plane wrapped around a post?
– axe
– crane
– screw
– crowbar
• Which of the above
tools relies on a lever
to reduce the amount
of force needed to
complete a task?
– ramp
– screw
– crowbar
– all of the tools
Question 47
Question 48
• Which of the following simple machines is
used to help the can opener below revolve
around the top of the can while opening it?
– lever
– pulley
– inclined plane
– wheel and axle
Question 49
• Because it uses several simple machines to
complete its task, the can opener can also be
referred to as a(n)
– utility machine
– complex machine
– advanced machine
– combination machine
Question 50
• To puncture the can, the can opener relies on
a sharp wedge. This wedge is a variation of
which simple machine?
– lever
– pulley
– inclined plane
– wheel and axle